Bacteria(細(xì)菌) are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in micron. One micron is a thousandth of a millimeter; a pinhead is about a millimeter across, Rod-shaped bacteria are usually from two to four microns long, while rounded ones are generally one micron across. Thus, if you magnified a rounded bacterium a thousand times, it would be just the size of a pinhead, while a grown-up human enlarged by the same amount would be over a mile tall.
Even with an ordinary microscope(顯微鏡), you must look closely to see bacteria. Using a magnification of 100 times, one can hardly find bacteria. Nor can one make out anything of their structure(結(jié)構(gòu)), of course. Only by using special colors, can one see that some bacteria have wavy-looking “hairs” called flagella. Others have only one flagellum. The flagella move round a central point, pushing the bacteria through the water. Many bacteria lack flagella and cannot move about by their own power, while others can move along over surface by some little-understood “machinery”.
From the bacterial point of view, the world is a very different place from what it is to humans. To a bacterium, water is as thick as molasses(糖漿) is to us. Bacteria are so small that they are affected by the movements of the chemical molecules(分子) around them. Bacteria under microscopes, even those with no flagella, often jump up and down in the water. This is because they knock with the water molecules and are pushed this way and that.
36. The underlined word magnified means _______________.
A. enlarged                                                      B. widened                  
C. killed                                                          D. caught
37. We know from the passage that _______________ is the smallest.
A. a pinhead                                            B. a rounded bacterium 
C. a microscope                                        D. a rod-shaped bacterium
38. The relationship between a bacterium and its flagella is most nearly like which of the following?
A. A rider jumping on a horse back 
B. A ball being hit by a bet
C. A boat powered by a motor    
D. A door closed by wind
39. Why does the writer compares water to molasses in the third paragraph?
A. To tell us how difficult it is for bacteria to move through water.
B. To suggest that bacteria are fond of different liquids.
C. To show different chemicals are of different structures.
D. To show that bacteria are the best swimmers.
40. Which of the following is the main topic of the passage?
A. The characteristic (特點) of bacteria.      
B. How bacteria reproduce.
C. The various parts of a bacterium’s body    
D. How bacteria cause diseases.            

小題1:A
小題2:B
小題3:C
小題4:A
小題5:A
練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中英語 來源:不詳 題型:閱讀理解


第二節(jié):閱讀表達(dá)(滿分15分)
Youth is a kind of wealth. It will gradually disappear with the time passing. We must treasure the time when we are young in order not to waste the most valuable things in our life.
What can we do not to waste our youth? In my opinion, the first thing is to realize our value, our ideas. I believe that everyone has his or her own ideas, maybe he or she wants to be an artist, drawing beautiful pictures; maybe to be a manager, setting up a big company; maybe to be a doctor, saving patients’ lives; maybe to be a singer,________. No matter what our ideas are, we must try hard to achieve them. When we are young, we are full of vitality( 活力  ).We have the best conditions in our lives, good memories, good understanding and so on. We should make full use of these conditions to study more in order to enrich our mind so as not to make our ideas only dreams forever.
For another, we should do as many things as possible we want to do (of course, they must be lawful) to enrich our lives, making it colorful and gathering many different experiences which are worth recalling when we are old.
Then when we are really old, when we can not move any more , we can be proud of our achievements, can recall those things we have experienced and we can say we have no regret in our lives.
So, now, act, for ourselves when we are young.
61. What is the best title of this passage? (Please answer within 10 words)
_____________________________________________________________.
62. Which sentence in the passage can be replaced by the following one? We will be proud and have no regrets when we are old.
______________________________________________________________________________________________________________________________________________________________
63. Please fill in the second paragraph with proper words or phrases to complete the sentence.( Please  answer in 10 words )
______________________________________________________________________________________________________________________________________________________________
64. According to the passage, which thing do you think is better in not wasting your youth? Why? ( Please answer within 30 words )
______________________________________________________________________________________________________________________________________________________________
65. Translate the underlined sentence in the second paragraph into Chinese.
___________________________________________________________________

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well, especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is not a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats, and other food additives, caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives, which we eat, are not all so direct. Farmers often give penicillin to beef and living animals, and because of this, penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration (FDA) has tried repeatedly to control these procedures, the practices continue.
61. What is the best possible title of the passage?
A. Drug and Food   B. Cancer and Health   C. Food and Health   D. Health and Drug 
62. Which of the following statements is NOT true?
A. Drugs are always given to animals for medical reasons
B. Some of the additives in our food are added to the food itself and some are given to the living animals
C. Researchers have known about the potential dangers of additives for over thirty---- five years.
D. Food may cause forty percent of cancer in world.
63. How has science done something harmful to mankind?
A. Because of science, diseases caused by polluted food have been virtually eliminated.
B. It has caused a lack of information concerning the value of food.
C. Because of the application of science, some potentially harmful substances have been added to food.
D. The scientists have preserved the color of meats, but not of vegetables.
64. What are nitrates used for?
A. They preserve flavor in packaged food.     B. They preserve the color of meats
C. They are the objects of research.         D. They cause the animals to become fatter.
65. The word “carcinogenic” most nearly means _________________
A. trouble–making  B. color– retaining C. money –making  D. cancer–causing

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

If you give something to someone for free, will that person value it and use it? Development experts have debated this question for decades. Some think the act of paying causes people to value something and use it more.
Selling necessary health treatments, others argue, may deny them to the people who need them the most.
Consider, for example, chemically treated bed nets, which kill mosquitoes anti protect people against malaria(瘧疾)while they are sleeping. William Easterly, an economist at New York University, believes this is one example of development having gone wrong. In a recent book, Professor Easterly suggests bed nets given free in Africa are often used for the wrong purpose. Yet, the World Health Organization (WHO) recommends bed nets be given out free and used by whole communities. The success of a large free bed net campaign in Kenya led the WHO to announce this recommendation
This debate will likely influence social programs in the developing world. Many non-governmental organizations support the creation of self-supporting programs in poor countries. Goods and services are sold for a price to help these programs survive.
According to Rachel Glenerster, who runs a research lab doing development and poverty studies at the Massachusetts Institute of Technology, her several studies have proven that small price changes have a big influence on the number of people who use a product. A price change will reduce the total amount of use of the product as well, she says. She has also found no evidence that the very act of paying for something changes how people use it.
As for a particular product among special populations, some development experts argue that pricing is useful. When it comes to bed nets, Miss Glenerster says research shows no evidence of this. People are just as likely to use a bed net whether they paid for it or not.
小題1: The debate among experts focuses on      .
A.a(chǎn) special use of bed nets in Africa
B.the use of assistance-related products
C.the importance of social programs for the poor
D.a(chǎn) popular way to help the poor
小題2: According to some experts, certain health treatments       .
A.can only be sold to the richB.should be completely free
C.a(chǎn)re too expensiveD.a(chǎn)re not needed by the poor
小題3:What can be inferred from Paragraph 2?
A.The WHO's advice may not be always practical.
B.Many Africans don't know the function of bed nets.
C.The case of Kenya is doubtful.
D.Bed nets given to Africans are poor in quality.
小題4: What may be the possible change in the social program according to the third paragraph?
A.Some of them may become financially independent.
B.Many of them will not be organized by the government.
C.Some of them will go to developed countries.
D.Most of them will be free of charge.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解



UN Secretary-General Ban Ki-moon said that "for the first time in history, more than one billion people are hungry."
The secretary-general made the statement in his message to the World Food Day, which fails on Friday. The World Food Day is celebrated on Oct. 16 annually, and the theme this year is "Achieving food security in times of crisis."
In his message, the secretary-general attributed the increase of hungry population world-wide to volatile (易變的) food prices, economic crisis, climate change and, conflict over the past two years.
Ban described food and nutritional security as "the foundations of a decent (正常的) life," saying that "the challenges of food security demand multilateral commitment (承諾), creativity and leadership."
"We must invest in food production and distribution (分配) ," he said. "Last year, I set up a. High-Level Task Force on the Global Food Crisis. Its Comprehensive (全方位的) Frame-work for Action outlines a strategy to provide safety nets and assistance for smallholder farmers and to support longer-term agricultural productivity and resilience, social protection schemes (方案), market access and fair trade. "
"The challenges of food security demand unilateral commitment, creativity and leadership. At this time of crisis, I encourage all nations to pursue coordinated (配合) and comprehensive strategies for agricultural development and effective social protection so that vulnerable people -- women and children in particular -- can get the food they need for nutritional security and well-being," he said.
60. Which day is the World Food Day?
A. On Oct. 16.        B. On Oct. 17.        C. On Oct. 15.        D. On Oct. 11.
61. How many reasons led to the increase, of hungry population worldwide according to the passage?
A. 3.                B.5.                 C.2.                 D.4.
62. What does the challenges of food security demand?
A. Multilateral commitment and leadership.
B. Volatile food prices, economic Crisis and climate change.
C. Multilateral commitment, creativity and leadership.
D. Coordinated and comprehensive strategies.
63. What is the theme of the World Food Day this year?
A. Fight Hunger to Reduce Poverty.                  B. Achieving food security in times of crisis.
C. Women Feed the World.                  D. Water: Source of Food Security.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


B
Rome-Doctors and medical groups around the world last weekend reacted with strong opposition to the news that an Italian specialist is on the point of cloning the first human baby.  
Dr.Severino Antinori, who is the head of a hospital in Rome, has been referred to in an Arab newspaper as claiming that one of his patients is eight weeks pregnant (懷孕的)with a cloned baby.  
Antinori refused to comment on the reports, but in March 2001 he said he hoped to produce a cloned embryo (卵)for implantation within two years.So far seven different kinds of mammals have already successfully cloned, including sheep, cats and most recently rabbits.  
Doctors showed their doubt and were strongly opposed although they admit that human cloning would finally come true unless there was a world wide ban on the practice.  
Professor Rudolf Jaenisch of the Whitehead Institute for Biomedical Research at the Massachusetts Institute of Technology said: “I find it astonishing that people do this where the result can be foretold that it will not be a normal baby.It is using humans as guinea pigs.It makes people feel sick.” But Ronald Green, director of the Ethics institute at Darmouth College in the US, said it is unlikely that an eight-week-old pregnancy would lead to a birth.  
So far all cloned animals have suffered from some different serious disorders, many of them dying soon after their births .  
Doctors are opposed to human cloning because they are worried about the welfare of the cloned child if there is one.  
“There are no benefits of cloned human beings, just harm,”said Dr.Michael Wilks of the UK.
45.What is the doctors’ general attitude to cloning of humans according to the passage?
A.They are against it.                    B.They support it.
C.They welcome it.                          D.They pay no attention to it.
46.Which of the following statements is true according to the passage?
   A.Doctor Severino Antinori is strongly opposed to cloning human beings.
   B.Up to now, seven kinds of animals have been cloned, including sheep, cats, humans and rabbits.
   C.Professor Rudolf Jaenisch is carrying on an experiment on cloning an eight-week-old embryo.
   D.Ronald Green doubts about the future successful birth of the so-called cloned embryo.
47.Which is the best title for the passage?
   A.The Success of Cloning Humans           B.The Anger at Cloning Humans
   C.Failure of Cloning Humans             D.First Cloned Human?

查看答案和解析>>

科目:高中英語 來源:不詳 題型:完形填空


第二部分:語言知識及應(yīng)用(共兩節(jié),滿分35分)
第一節(jié):完形填空(共10小題;每小題2分,滿分20分
閱讀下面短文,掌握其大意,然后從21~30各題所給的A、B、C和D項中,選出最佳選項,并在答題卡上將該項涂黑。
Today, many people are starving to death. Recently, a man who wanted to understand the conditions of such people _21_    an experiment. He only ate one meal a day for a month but continued to work as he normally did.
During the first five days he was _22   _ at his regular mealtime, but after he had drunk a glass of water, his hunger 23_   . In the morning, when he ate his one meal, he ate quickly and had a_24   _ amount. During the next few days, he was not hungry during the day, but when he _25     a food stall (a place on which food is put to be sold), the smell of food caught his 26    . During the third and the fourth weeks, he had hunger pains and lacked physical strength. He looked forward to this one meal and ate it slowly, enjoying every bite. Without it, he knew he would he would have hardly enough 27      to work.
This experiment changed his attitude about some things. Having a cup of tea was not 28    a pastime. It also gave him strength. He more frequently noticed overweight people and people who threw away leftover food. He  29     the importance of food hungry person. He could no longer easily pass by a hungry beggar on the street. But most 30     , he could now sympathize(同情) in a similar way with the hungry people of the world.
21.  A. took along        B. carried out     C. put on        D. brought in
22.  A. hungry            B. angry                      C. happy          D. excited
23.  A. came about       B. broke out          C. set off         D. went away
24.  A. small           B. ordinary         C. large         D. common
25.  A. noticed          B. watched          C. recognized     D. glanced
26.  A. interest         B. eyes             C. imagination      D. attention
27.  A. power           B. spirit             C. energy              D. feeling
28.  A. just             B. still               C. yet                    D. exactly
29.  A. admitted               B. realized          C. remember         D. valued
30.  A. seriously        B. luckily           C. necessary        D. important

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


It’s not a particular brain region that makes someone smart or not smart. Nor is it the strength and speed of the connections throughout the brain or such features as total brain volume. Instead, new research shows, it’s the connections between very specific areas of the brain that determine intelligence.
“General intelligence actually relies on a specific network inside the brain, and this is the connections between the gray matter, or cell bodies, and the white matter, or connecting fibers between neurons(神經(jīng)元),”said Jan Glascher, lead author of a paper appearing in this week’s issue of the Proceedings of the National Academy of Sciences.
The results weren’t entirely unexpected, said Keith Young, vice chairman at Texas A﹠M Health Science Center College of Medicine in Temple, but “it proves that good communication between various parts of brain are very important for this general intelligence.”
“People noticed a long time ago that, in general, people who are good test-takers did well in a lot of different subjects,”explained Young. “If you’re good in mathematics, you’re also usually good in English. Researchers came up with this idea that this represented a kind of overall intelligence.”
Hoping to learn more, some experts located 241 patients who had some sort of their lesions (損害). They then diagrammed the location of their lesions and had them take IQ testes. “We took patients who had parts of their brain damaged, tested them on intelligence to see where they were good and where they were bad, then we connected those scores across all the patients with the location of the brain lesions,”Glascher explained. “That way, you can know the areas that are associated with reduced performance on these tests, which means these areas are really important for general intelligence.”
“These studies suggest results based on the absence of brain tissue (組織),”added Paul Sanberg, famous professor and director of the University of South Florida Center. “It allows them to systemize and find areas important to intellingence.”
1. Which of the following is the best title for the passage?
A. General Intelligence Depend on Brain Volume
B. Scientists Explain Mysteries of Intelligence
C. Science Research Done on Human Brain
D. Brain Lesions Cause Patients Stupid
2.According to Keith Young, we can infer that_____________.
A. the parts of brain are working smooth on their own
B. a person good at maths has obstacles learning languages
C. overall intelligence will make a person successful
D. Jan Glascher’s article really shocks the world
3. Why did experts locate 241 patients with some sort of brain lesions?
A. To diagram the location of their lesions.
B. To take IQ tests to the patients.
C. To know more about the secrets of intelligence.
D. To take better care of the patients.
4.From the diagram, the experts concluded that_____________.
A. the absence of brain tissue will influence intelligence
B. the brain lesions can improve the performance
C. patients with brain lesions will get a high score
D. Some areas totally determine the ability of intelligence

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

People express their personalities in their clothes, their cars, and their homes. Our diets can also show our personalities because we might choose certain food to tell people something about us.
For example, some people mainly enjoy high quality food, such as caviar (魚子醬) and lobster (龍蝦), and they eat only in expensive restaurants – never in cafeterias or bars. They know about the “better things in life”.
Some people choose not to eat meat. Vegetarians often have more in common than just their diet. Their personalities might be similar too. For instance, vegetarians in the United States and Canada may be creative people, and they might not enjoy competitive sports or jobs. They worry about the health of the world, and they are probably strongly against the war.
Some people eat mostly fast food. One study shows that many fast-food eaters have a lot in common, but they are very different from vegetarians. They are competitive and good at business. They are also usually in a hurry. Many fast-food eaters might not agree with this description of their personalities, but it is a common picture of them.
Some people also believe that people of the same astrological sign(星座)have similar food personalities. Aries (born under the sign of Aries, between March 21 and April 20) usually like spicy foods, with a lot of onions and pepper. People with the sign of Taurus (April 21 to May 22) prefer healthful fruits and vegetables, but they often eat too much. Sagittarius (November 22 to December.22) like traditional food from many different countries.
What is your food personality?
小題1:Why do some people mainly eat high quality food?
A.They want to show off their wealth.B.Food can show off their social position.
C.They want to enjoy better things in life.D.They are wiser than any other persons.
小題2:A vegetarian may be a person________.
A.who is believed to be a peace – loverB.who values the importance of success
C.who cares little about the future of the worldD.who shows his power to make money
小題3:From the passage, we can draw a conclusion that_____________.
A.food is just a mirror of the human history
B.we can know a person from what he eats
C.people are particular about the food they eat
D.what people eat may change their personalities

查看答案和解析>>

同步練習(xí)冊答案