Forests have always been useful and important to man who makes use of them in many ways. Every day trees are serving man everywhere. Trees supply man with fruits and building materials in the form of wood. Without trees it would be impossible to build houses, boats, bridges and so on. Furniture such as desks, chairs and beds is made of wood. Trees can stop man from terrible heat. They're also useful in preventing good and rich top soil from being washed away during heavy rains.
　　If there were no trees, heavy rains would wash away the rich top soil that is so important to plants. The result is that the land will become a desert. There are plenty of desert areas in the world. A long time ago these desert areas used to be very rich areas, but man in the past had no enough knowledge about science of nature, they cut down too many trees in the area where they lived and never planted new ones. By and by the rich top soil was blown and washed away by strong winds and heavy rains. In the end the rich land changed into useless deserts where nothing could grow.
小題1:According to the passage, ______.
A．a(chǎn) long time ago, man didn't know how to make use of wood
B．trees are not as useful as they were in the past
C．trees were more found in the past than they are today
D．people have always found trees useful
　　小題2:If there were no trees, ______.
A．the land would become betterB．heavy rains would be very clean
C．the rich soil couldn't be keptD．there wouldn't be any plants
　小題3:From the passage, we know that man must ______.
A．do nothing to keep the balance（平衡）of nature
B．take his best to keep the balance of nature
C．try his best to keep the balance of nature
D．do his best to stop the balance of nature

小題1:D
小題2:C
小題3:C

小題1:這是一道細(xì)節(jié)題。從文中第一句話可知道答案。
小題2:這是一道細(xì)節(jié)題。從文中第二段內(nèi)容可知，沒有樹就會(huì)造成水土流失。
小題3:從文中內(nèi)容可知，人類必須盡最大努力保持生態(tài)平衡。
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：完形填空


US president Barack Obama told students that it takes hard work in school to prepare for a rewarding career in his “back to school” speech,   36  last Tuesday in Virginia, US. Here is excerpt （節(jié)選）from his speech:
I know that sometimes, you get the  37    that you can be rich and successful without any hard work –  38   your ticket to success is through rapping or basketball or being a reality TV star, when chances are, you’re not going to be any of those things. But the truth is, being successful is   39   .You won’t love every subject you study. Not every homework assignment will seem completely important to your life right this minute. And you may not succeed at    40     the first time you try.
That’s OK. Some of the most successful people in the world are the ones who’ve had the most   41  .JK Rowling’s first Harry Potter book was   42  12 times before it was finally published. Michael Jordan was    43    his high school basketball team, and he lost hundreds of games and missed thousands of shots during his career. But he once said. “I have failed over and over and over again in my life. And that is why I succeed.”
These people succeeded because they understand that you can’t let your failures  44   you. No one’s    45  being good at things; you become good at things through hard work.
Don’t be afraid to ask questions. Don’t be afraid to ask for help when you need it. I do that every day. Asking for help isn’t a sign of weakness; it’s a sign of    46    . It shows you have the courage to admit when you don’t know something, and to learn something new.
And even when you’re  47     , even when you’re discouraged, and when you feel like other people have given up on yourself, you won’t give up on yourself. Because when you give up on yourself, you give up on your country.
36. A. addressed                  B. claimed                   C. delivered                  D. announced
37.A. feelings               B. definition           C. concept                      D. sense
38. A. that                           B. which                       C. what                          D. whatever
39. A. inaccessible                    B. hard                        C. rough                          D. unavailable
40.A, anything                          B. everything                 C. nothing                        D. something
41. A. effort                B. attempts                   C. failures                        D. successes
42. A. denied             B. turned away        C. declined           D. rejected
43. A. cut from                        B. cut off                       C. cut down           D. cut in
44. A. confirm                          B. define                      C. identify                        D. prove
45. A. brought up             B. raised                        C. fed                           D. born
46. A. strength             B. courage                       C. weakness                      D. perseverance
47. A. struggling                 B. fighting             C. trying                          D. succeeding

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解


Besides giving off gases and dusts into the air, humans produce waste that is poured on the environment. Often, this waste produced by major industries and people is harmful to both nature and human life.
One of the main causes of the large amount of dangerous waste is that people do not realize how large a problem it is. Because it can be simply removed and sent to a landfill（廢渣填埋場(chǎng)）, the problem is often believed to end there. In addition, industries have often shown an unwillingness to find ways to deal with dangerous waste because of the related expenses. Many industries and governments build simple landfills to store waste, and often just pour waste chemicals into nearby bodies of water. Often, chemicals used for industrial production cause dangerous forms of waste. The amount of these chemicals has increased greatly in the past, but it is often difficult and expensive to get rid of these chemicals or to store them in a way safe to human life and the environment.
Every year, major health problems result from dangerous waste. Sadly, it is often only after someone has died or become seriously ill that governments will take measures to reduce levels of harmful waste.
Some governments have realized how serious the dangerous waste problem is and are now trying to settle this problem. They are also trying to limit the amount of waste industries are allowed to produce.
Not only governments but ordinary people as well must work together to solve the problem. They can choose not to buy those products which require the production of dangerous waste, and produce less harmful waste themselves. Many scientists think that waste production can be cut. The waste can be reduced by at least one third using existing technologies and methods.
72. What would be the best title for the text?
A. Measures of Reducing Dangerous Waste
B. Danger of Harmful Waste to Mankind
C. Dangerous Waste and Water Pollution
D. Environmental Protection
73. According to the text, people       .
A. do not produce harmful waste in their daily life
B. do not know where to place the dangerous waste
C. are not clear about how serious the dangerous waste problem is
D. are not sure about where harmful waste ends
74. What troubles industries most in dealing with the dangerous waste problem?
A. How to get government support.
B. How to increase their production.
C. How to store harmful waste.
D. How to cut down the related costs.
75. What can be inferred from the passage?
A. The polluting industries are not allowed to sell their products.
B. Present technologies have settled the harmful waste problem.
C. Everyone should obey the government rules for the problem.
D. To solve the problem requires the efforts of the whole society.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

RichardSolo 1800 Rechargeable Battery
In just minutes a day, plug in and charge your iPhone quickly!
Just plug RichardSolo 1800 into your iPhone once or twice a day, for fifteen minutes, and keep your iPhone charged up. At your desk, or at dinner, plug RichardSolo into iPhone to instantly transfer charge. No more battery worries. RichardSolo will charge iPhone to full 1.5 times, and it is good for 3-5 years of recharges.
Use the iPhone while charging it. Even charge the RichardSolo 1800 and iPhone together at the same time. Take only one charger when traveling and wake up in the morning with the RichardSolo and the iPhone charged.
RichardSolo 1800 is largest in its class and holds its charge for months. Works with almost all iPhone cases.
Your satisfaction is guaranteed, with our 30-day return privilege. If you’re not satisfied for any reason, we’ll email you a pre-paid return label.
Actual customer comments:
To have your company exhibit such good service is unbelievably refreshing. — P.S.
This is what I call great customer support. I wish more companies would figure this out these days. Thank you so much. — D.C.
You have provided me one of the best services I have ever seen on any online/ telephone shopping. — T.K.
You must have the fastest processing and shipping in the industry!! — M.C.
This is the best customer service experience I have had in a long time. — L.L.
I’ve read online about your amazing customer service, and I must say I’m now a true believer. — B.L.
小題1:How long does it take the battery to charge up an iPhone?
A．15 minutes.B．30 minutes.C．1.5 hours.D．3 hours.
小題2:What is special about the battery?
A．It is built in an iPhone.
B．It is the smallest of its kind.
C．It can also be used as a charger.
D．It keeps power for about 30 days.
小題3:Who mentions the transporting of the battery?
A. P.S.    B. B.L. C. M.C.     D. T.K.
小題4:The customer comments on the battery are mainly about its _______.
A．qualityB．serviceC．functionD．shopping

查看答案和解析>>

科目：高中英語 來源：不詳 題型：完形填空

閱讀下面短文，掌握其大意，然后從36—55各題所給的四個(gè)選項(xiàng)（A、B、C和D）中，選出最佳選項(xiàng)，并在答題卡上將該項(xiàng)涂黑。
I was coaching girls’ track in Iowa and there was a young discus（鐵餅）thrower on the team with  36  potential（潛力）. Here goes her story.
At the end of our training   37  the district track meet, this discus thrower, Lucy, asked me if she   38  come to the school on Sunday for a little   39  training. I agreed. The year before, she had placed second at the district meet and   40  missed going to the state meet. She had won every discus event,   41  that district meet! And, her throws in the competitions had   42  been between 106’1” and 110’10”.
Something began to   43  me. Why couldn't Lucy   44  to get the discus to 111 feet? I wondered if it was more a psychological barrier（心理的障礙）  45  a physical one. I decided to try something   46 . I made up my mind to   47  to Lucy.
On Sunday, after her drills, I said, “Why don’t you throw five or six good ones for me to  48 ?” She began to throw again, but   49  were farther than what she had already thrown. But, I didn’t tell Lucy. As I was measuring the   50  one, I pulled out some more tape (量尺) and yelled out to her, “ Come to see this! This one is  51 ! ” It wasn’t. Lucy, thinking that this was a personal best, jumped wildly into the air in  52  .
The next afternoon, at the district meet, Lucy   53  with a personal best throw of 114’10”! Just 24 hours after I had lied to her. However, this time she had   54  thrown the discus four feet further than she had ever thrown it before.
Sometimes we   55  our own barriers in our mind. So learn to take control of your mind.
21．A. little          B. great           C. no              D. limited
22．A. after           B. during          C. since           D. before
23．A. could           B. must           C. should         D. would
24．A. helpful        B. extra          C. real           D. regular
25．A. luckily         B. completely     C. narrowly        D. probably
26．A. except         B. including      C. despite        D. with
27．A sometimes       B. always         C. never          D. seldom
28．A. frighten       B. please         C. shock          D. bother
29．A. seem           B. pretend        C. need           D. ask
30．A. apart from     B. rather than    C. because of      D. according to
31．A. impossible     B. familiar       C. new             D. easy
32．A. lie            B. turn           C. reply          D. call
33．A. look           B. measure        C. match          D. take
34．A. many           B. all            C. some           D. none 
35．A. worst          B. closest        C. first          D. final
36．A. higher         B. farther        C. bigger         D. longer
37．A. excitement     B. anxiety        C. puzzlement     D. anger
38．A. disappeared    B. lost           C. won            D. arrived
39．A. actually        B. hardly         C. nearly          D. only
40．A. break          B. remove         C. take           D. set

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

The people below are all looking for a course on Chinese to study. Read the following information about the six courses. Decide which course would be the most suitable for the people mentioned in questions 61-65 and then mark the correct letter (A-F) on your answer sheet. You can choose any letter more than once, and some of the letters may not be chosen.
______1. Mathew majors in media and hopes to understand Chinese broadcasting and TV News and communicate with the Chinese people.
______ 2. Sarah is a Learner of Chinese with a fairly good knowledge of basic Chinese grammar and a vocabulary of 2500, hoping to improve her Chinese ability in speaking, reading and writing.
______ 3. Lois majors in Teaching Chinese as a Foreign Language and hopes to improve her ability in translation.  
______ 4. Dennis once has taught himself Chinese and can speak a little Chinese but with poor pronunciation and grammar, hoping to meet the needs of everyday life and study, and understand each other in basic communication through training.
______ 5. Georgia specializes in the Chinese language and culture at the average. He plans to have a tour in China.
A．Comprehensive language skill training
100 lessons in total focusing on pronunciation, grammar and discourse (語段). To enable the learner to master the basic knowledge of the Chinese language, to have the basic ability of listening, speaking, reading and writing, so that they are able to communicate with others and to meet the needs of everyday life, study and socialty. This will lay a foundation for further study of Chinese.
B．Intermediate (中等) Chinese Comprehensive Course
40 lessons in all, focusing on the training of the comprehensive skills of listening, speaking, reading and writing of intermediate Chinese. To enable the students to recognize, understand and use the active and less active words, to improve their ability of expressing themselves in paragraphs and discourse, to master the new words, patterns, grammatical structures, paragraphs and discourse and means of connections so as to express the meaning of the texts correctly and fluently in paragraphs and discourse.
C．News Listening
Based on frequently used words, typical sentences and information and concentrating on improving the ability of listening comprehension. To improve the ability of collecting information, to grasp the knowledge and skills they have learned and to understand the broadcasting and TV news of similar themes and relevant level of difficulty with the correctness of 80%. To build up the foundation for further study.
D．Elementary English-Chinese Translation
25 classes in total, including various styles such as poems, popular science, political comments and news, about every aspect of everyday life. The texts vary from easy to difficult and combine theory with practice as well as translation and interpretation. About 185 hours are needed. To familiarize the learner with the equivalent (對(duì)應(yīng)的) Chinese expressions of English. To enable them to know usage of Chinese and English words and sentences, cultural differences and the background knowledge.
E. Elementary Spoken Chinese in Business
24 units in all. Chinese words and expressions in business and trade are introduced in the form of vivid situational dialogues, notes and exercises. To enable the learner to master the words and expressions of elementary spoken business Chinese and to communicate with others in trade and business.
F. Chinese Human Geography
Introduction to geographic environment and cultural phenomena in various parts of China, such as natural features, historical backgrounds, religious sites, ancient battle fields, dramas and arts, traditional products, and special food, etc. Through the introduction to historical and cultural sites and scenery, the learner will have a general view about Chinese geography, history, culture and regional features.
Getting away for a short time always seems like a great idea — until you have to pack. But packing won’t be a problem if you keep in mind one simple rule. Whether you’ll be sleeping overnight at a friend’s house, or visiting a relative for a week, the rule is: pack light. Here are some tips to help you pack.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Have you ever dreamed of visiting a planet in the Milky Way (銀河系)? While the trip sounds exciting, it would take years and years to reach your destination. So in the future, bedtime for astronauts may be more than a few hours of regular shut eye. They would have to sleep for years.
European researchers are now conducting hibernation experiments. The study may help them understand whether humans could ever sleep through the years it would take for a space flight to distant planets. "If there was an effective technology, it could make deep-space travel a reality," said Mark Ayre of the European Space Agency last month.
What seems like a science fiction is not completely unlikely. Researchers have been able to use chemicals to put living cells into a sleep-like state where they don’t age. They have now moved on to the small, non-hibernating mammals (哺乳動(dòng)物) like rats.
A major challenge is the fact that cells can be very simple systems, whereas body organs are far more complex (復(fù)雜的). "It’s like moving from a simple Apple computer to a supercomputer," said Marco Biggiogera, a hibernation researcher at Italy’s University of Pavia．Just like bears and frogs, the hibernation of human beings would cause a person’s metabolism (新陳代謝) to lower so they would need less energy.
Medical research, however, is just half of a space flight hibernation system. There is a challenge of designing a suitable protective shelter (棲身所). Such a shelter would provide the proper environment for hibernation, such as the proper temperature. It would also have to monitor (監(jiān)控) life functions and serve the physiological needs of the hibernator.
According to Ayre, the six-person Human Outer Planets Exploration Mission (使命) to Jupiter’s moon (木星的衛(wèi)星) Callisto could be an opportunity to use human hibernation. The mission aims to send six persons on a five-year flight to Callisto, where they will spend 30 days, in 2045.
小題1:According to the article, the hibernation research ______.
A．is just an ideaB．is always a science fiction
C．has already finished successfullyD．has made some progress
小題2:In a hibernating state, a person needs ______.
A．less sleep B．more foodC．less energyD．more movement
小題3: The first try of the hibernation technology _____ the six-person Human Outer Planets
Exploration Mission to Jupiter’s moon Callisto.
A．will beB．has been planned for
C．is certain to beD．may be
小題4:What is the best title of the article?
A．Hibernation Study For Space TravelB．Welcome To Our Space Travel
C．To Hibernate, To Live Longer D．Welcome To The Milky Way

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

It will be hot—hot enough that most locals will have cleared town for cooler places. But because athletes competing at the 2004 Olympics have no choice but to stay in the hot weather, many plan to turn to science to stay cool.?
Some will put their hands in ice water just before competing and nearly all will be wearing fabrics(織物) designed with hot weather in mind.?
“Normally we warm up before exercise,”said Gordon Sleivert, director of sports science and medicine at the Canadian Sport Center in Victoria, British Columbia.“But in this case we're taking the warm out of warm up. It's like pre-cooling.”
Experts are predicting(預(yù)測(cè)) the average high this August in Athens will be 90 degrees Fahrenheit, with temperatures often reaching above 100(the average temperature in Sydney for the 2000 summer games was 64).?
Although some events, such as the marathon, will start early(1 a.m.) to avoid hot weather, other competitors will be pushing their limits during high temperatures.?       Drinking lots of water will help athletes keep cool, but humidity(濕度) remains a problem. The body's ability to cool down is weakened by damp air since sweat drips off the skin rather than evaporates(蒸發(fā)),resulting in dehydration(脫水) without the cooling.?
“Getting hot is a real problem because when our brains heats up, the brain waves are more like when you're really sleepy. Everything feels harder,” said Sleivert.
小題1: The passage mainly tells us that _______.
A．why it is very hot in Athens?
B．the hot weather is a big problem for Olympic athletes?
C．how important science is to every athlete?
D．the Olympics will be put off because of the hot weather?
小題2:The underlined sentence “other competitors will be pushing their limits during high temperatures”in the fifth paragraph means _______.?
A．Olympic athletes will put off their competition time?
B．some events in the Olympics will have to be put forward?
C．competitors can't reach their limits in the hot weather?
D．competitors will have to try their best to compete under any condition?
小題3:The following things will be likely to happen in the hot weather EXCEPT _______.
A．dehydration?
B．being sleepy?
C．that the blood in the body can become less and less?
D．that the body's ability to cool down is weakened

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Everywhere man is altering the balance of nature．He is facilitating the spread of plants and animals into new regions, sometimes deliberately, sometimes unconsciously．He is covering huge areas with new kinds of plants, or with houses, factories, slag-heaps and other products of his civilization．He exterminates some species on a large scale, but favours the multiplication of others．In brief, he has done more in five thousand years to alter the biological aspect of the planet than has nature in five million．
Many of these changes which he has brought about have had unforeseen consequences．Who would have thought that the throwing away of a piece of Canadian waterweed would have caused half the waterways of Britain to be blocked for a decade, or that the provision of pot cacti for lonely settlers’ wives would have led to Eastern Australian being overrun with forests of Prickly Pear? Who would have prophesied that the cutting down of forests on the Adriatic coasts, or in parts of Central Africa, could have reduced the land to a semidesert, with the very soil washed away from the bare rock? Who would have thought that improved communications would have changed history by the spreading of disease-sleeping sickness into East Africa, measles into Oceania, very possibly malaria into ancient Greece?
These are spectacular examples; but examples on a smaller scale are everywhere to be found．We make a nature sanctuary for rare birds, prescribing absolute security for all species; and we may find that some common and hardy kind of bird multiplies beyond measure and ousts the rare kinds in which we were particularly interested．We see, owing to some little change brought about by civilization, the starling spread over the English country-side in hordes．We improve the yielding capacities of our cattle; and find that now they exhaust the pastures which sufficed for less exigent stock．
小題1:The following examples except ________ reflect man altering the balance of nature．
A．man is covering huge areas with new kinds of plants
B．man is facilitating the spread of animals into new regions．
C．man is killing some species on a large scale
D．man is getting to know the importance of keeping the balance of nature．
小題2:What had a piece of Canadian waterweed cause?
A．Eastern Australian was overrun with forests．
B．Half the waterways of Britain blocked for a decade．
C．In parts of central Africa, the land reduced to a semidesert．
D．Disease-sleeping has been caused．
小題3:What have spread diseases?
A．Disease-sleeping sickness．B．Measles．
C．Improved communications．D．Malaria．
小題4:We make a nature sanctuary for rare birds but __________
A．some common and hardy kind of bird multiplies
B．rare kinds multiply
C．a(chǎn)ll bird multiply
D．no bird multiply
小題5:The main idea of the passage is _________．
A．that man is deliberately destroying the balance of nature
B．that man has foreseen the consequences of altering the balance old nature
C．that improved communications have changed history
D．that man is altering the balance of nature

查看答案和解析>>

同步練習(xí)冊(cè)答案