At night, bats fly through the air, catching hundreds of insects and other small animals. But during the day, they hardly move at all. Instead, bats pass the time hanging upside down from a secret spot.
There are a couple of reasons why bats rest this way. First of all, it puts them in a position for takeoff. Unlike birds, bats can’t fly into the air from the ground. Their wings don’t produce enough lift to take off from a dead stop, and their hind legs are so small and underdeveloped that they can’t run to build up the necessary takeoff speed. Instead, they use their front claws to climb to a high spot, and then fall into flight.
During the hours when most enemies are active, bats gather where few animals would think to look and most can’t reach. This allows
them to disappear from the world until night comes again. There’s also little competition for these resting spots, as other flying animals don’t have the ability to hang upside down.
Bats have a unique physiological adaptation that lets them hang around this way without using a
ny energy. For you to hold your fist around an object tight, you contract（緊縮）several muscles in your arm, which are connected to your fingers by ten
dons（腱）；as one muscle contracts, it pulls a tendon, which pulls one of your fingers closed. A bat’s talons（爪）close in the same way, except that their tendons are connected only to the upper body, not to a muscle. To hang upside down, a bat pulls its claws open with other muscles. To get the talons to take hold of the surface, the bat simply lets its body relax. The weight of the upper body pulls down on the tendons connected to the talons, causing them to hold tight. Therefore, the bat doesn’t have to do anything to hang upside down.
【小題1】Bats hang upside down because________．
| A．they haven’t developed a pair of strong claws | B．they can’t start to fly from the ground directly |
| C．they have no hind legs to support their body | D．they can’t find quiet places to stay during the day |
| A．is to save their energy for night movement | B．is a way to fight against flying animals |
C．is a great way to hide from danger | D．is a skill to compete for the flying places |
| A．Because their upper body is light. |
| B．Because they have strong muscles. |
| C．Because their talons are linked to muscles tightly. |
| D．Because their tendons are linked to their upper body. |
| A．The living habits of bats. | B．How and why bats  hang upside down. |
| C．The importance of bats’ hanging upside down. | D．How bats use their energy at night. |
智慧課堂密卷100分單元過關(guān)檢測系列答案
單元期中期末卷系列答案科目：高中英語 來源：2013屆河北省邯鄲一中高三10月月考英語試卷（帶解析） 題型：閱讀理解
Is losing weight as simple as doing a 15-minute writing exercise? In a new study, women who wrote about their most important values, like close relationships or religion, lost more weight over the next few months than women who didn't. "We have this need to feel self-integrity (正直,誠實）,” says Christine Logel of the University of Waterloo. "When something threatens your sense that you're a good person, like failing a test, we can buffer（緩沖） that self-integrity by reminding ourselves how much we love our children, for example".
For this study, the researchers recruited 45 female undergraduates, of whom 58% were overweight. Each woman was weighed, and was then given a list ofimportant values, like creativity, music or relationships with friends and family members. Each woman ranked the values in order of how important they were to her. Then half the women were told to write for 15 minutes about the value that was most important to her. The other half, a control group, were told to write about why a value far down on their list might be important to someone else.
The women came back months later to be weighed again. Women who had written about an important value lost an average of 3.41 pounds, while women in the control group gained an average of 2.76 pounds.
"How we feel about ourselves can have a big effect," Logel says. Maybe when one of the women who wrote about an important value went home that night, she felt good about herself and didn't eat to make herself feel better. Over a few months, that could make a real difference in her life,
【小題1】How can a 15-minute writing exercise ofimportant values affect people?
| A．They will feel proud of themselves and gain weight gradually. |
| B．They may feel good about themselves and then eat less than usual. |
| C．They may continue writing and decide to become a professional writer. |
| D．They will never have meals at night to make themselves lose weight. |
| A．Only the control group was given a list ofimportant values. |
| B．Both groups ranked the values in order of importance to them. |
| C．Each woman was weighed three times in the process of the study. |
| D．The overweight women wrote about the value most important to them. |
| A．Mary who wrote about her own adventure. |
| B．Catherine who described her illness in her writing. |
| C．Shirley who wrote how much she loved her children. |
| D．Alice who complained her boss in her diary. |
| A．Writing Benefits Women a Lot |
| B．Losing Weight Is Very Simple |
| C．Writing Contributes to Losing Weight |
| D．Women Values Losing Weight |
查看答案和解析>>
科目：高中英語 來源：青海西寧市十四中2009--2010學(xué)年度高二下學(xué)期期中考試英語試卷 題型：閱讀理解
.
In the 19th century, Americans from the eastern states moved out west to settle in the rich new lands along the Pacific Coast. The most difficult part of their trip was crossing “the Great American Desert” in the western part of the United States by horse and wagon.
The western desert can be very dangerous. There is little water and there are few trees. But the desert also has scenery of great beauty. Tall towers of red and yellow stone rise sharply from the flat, sandy valley floor. The scene has been photographed many times and appears in movies and on TV.
In Arizona, man-made dams across the Colorado River have made two large lakes in the middle of the dry desert country. At Lake Powell, the red stone arch of Rainbow Bridge rises high above the blue lake.
There are few roads. Many areas of Lake Powell’s shore can only be reached by boat or on foot. But hikers in this empty desert land sometimes find very old native American pictures, painted on the rocks.
In Death Valley, California, the summer temperature rises to 130°F—165°F. There is less than inches of rain each year. Death Valley is the lowest place in America---925 meters below sea level. In the 1800s, many travelers died when they tried to cross this waterless valley in the terrible heat.
Although the desert is dry and seems empty, there is plenty of life if you look closely. Snakes and rats have learned how to live in the desert heat. They live underground and come out at night, when it is cool. Plants such as cacti need very little water. When it does rain in the desert (sometimes only once or twice a year), plants grow quickly, and flowers open in a single day. For a short time, the desert is covered with brilliant (very bright) colors.
67．In the 19th century, Americans moved from east to west because they .
A．enjoyed the trip B．wanted to make their home there
C．wanted to find new grassland there D．had no water to drink
68．From this passage. we can conclude that .
A．the western desert is a good place for people to live in
B．there is little water but there are many trees in the desert
C．the desert is dangerous but it is full of beauty
D．till now, people know little about the desert
69．In the 1800s, many travelers died in Death Valley because of .
A．illness B．high temperature
C．cold weather D．poisonous water
70．In the desert, animals will die .
A．if they move about B．if they can’t make holes underground
C．if they come out at night D．if they drink much water
查看答案和解析>>
科目：高中英語 來源：2010年吉林省汪清縣第六中學(xué)高二下學(xué)期期末考試英語卷 題型：閱讀理解
Empty Deserts
In the 19th century Americans from the eastern states moved out west to settle in the rich new lands along the Pacific coast. The most difficult part of their trip was crossing the “Great American Desert in the western part of the United States by horse and wagon.
The western desert can be very dangerous. There is little water and there are few trees. But the desert also has scenery of great beauty. Tall towers of red and yellow stone rise sharply from the flat sandy valley floor. The scene has been photographed many times and appears in movies and in TV.
In Arizona, man made dams across the Colorado River have made two large lakes in the middle of the dry desert country. At Lake Powell, the red stone arch of Rainbow Bridge rises high above the blue lake.
There are few roads. Many areas of Lake Powell’s shore can only be reached by boat or on foot. But hikers in this empty desert land sometimes find very old native American pictures, painted on the rocks.
In Death Valley, California, the summer temperature rises to 130 degrees. There is less than two inches of rain each year. Death Valley is the lowest place in America---- 925 meters below sea level. In the 1800s, many travelers died when they tried to cross this waterless valley in the terrible heat.
Although the desert is dry and seems empty, there is plenty of life if you look closely. Small insects, snakes and rats have learned how to live in the desert heat. They live under ground and come out at night, when it is cool. Plants such as cacti need very little water. When it does rain in the desert (sometimes only once or twice a year), plants grow quickly, and flowers open in a single day. For a short time, the desert is covered with brilliant colors.
【小題1】In the 19th century, Americans moved from the east to the west because they ______.
| A．enjoy the trip | B．wanted to make their home there |
| C．wanted to find new grassland there | D．had no water to drink |
| A．the western desert is a good place for people to live in |
| B．there is little water but there are many trees in the desert |
| C．the desert is dangerous but it is full of life |
| D．till now, people know little about the desert |
| A．on foot | B．by boat | C．by car | D．by plane |
| A．illness | B．high temperature |
| C．cold weather | D．poisonous water |
| A．if they move about | B．if they cannot make holes underground |
| C．if they come out at night | D．if they drink much water |
查看答案和解析>>
科目：高中英語 來源：2013-2014學(xué)年安徽省六校教育研究會高三2月聯(lián)考英語試卷（解析版） 題型：其他題
閱讀下面短文，根據(jù)所讀內(nèi)容在表格中的空白處填入恰當(dāng)?shù)膯卧~。注意：每個空格只填一個單詞。
Once kids hit the teenage years, parenting becomes more difficult than ever. Establishing effective house rules is one of the best ways to educate teenagers. House rules must respect teenagers’ desire to be independent and make sure they behave responsibly.
How can effective house rules be established?
First of all, get your teenager to take part in making the rules, which can help keep them motivated to follow them. Ask their opinion about what sorts of things they think are important when creating the rules and try to include some of their ideas.
When creating the list of rules, don’t list every single rule imaginable. Instead, try to limit it to the ten most important rules. I’ve seen some parents come up with several pages of rules which turn out to be more like a rule book rather than a list. Remember, it is important to make the list easy to remember and to be a basic guide.
Then, it is important that you write out the list of rules and hang them in a prominent (顯眼的) location. Keeping the rules on the refrigerator or displayed somewhere where everyone can see them is a good reminder. Revise the rules whenever there’s a need, not very frequently though.
Explain clearly in advance what negative consequences will be in store when a rule gets broken. But ensure that none of your consequences are equal to abusive parenting. For example, take off the rule that says — “if you don’t get home by 11 at night, make arrangements to stay elsewhere until morning”. Let helping with small household chores like cleaning up their own rooms serve as consequences for disobeying rules.
Following these tips on establishing effective house rules accompanied by constant positive reinforcement (執(zhí)行) will help improve your teenager’s behavior. Hope you can direct your teenager to become a responsible and independent person with the help of house rules!
Establishing house rules for1.__________
|
Requirements for house rules |
They must respect teenagers’ desire to be independent and 2._____________ teenagers behave responsibly. |
|
|
3.________ on how to establish effective house rules |
4.________ teenagers in making the rules |
Ask their opinions Include their ideas |
|
Keeping the house rules simple
|
Avoid 5._______ every single rule Limit the list to the most important rules |
|
|
Creating a 6.______ list of rules |
Put it up somewhere visible to 7.______ your teenager of the rules Make the rules revised when necessary |
|
|
Giving a clear 8.____________ of the consequences |
Don’t abuse children if they 9.________ rules |
|
|
Conclusion |
Your teenager’s behavior will be 10.____________ with the help of effective house rules. |
查看答案和解析>>
科目：高中英語 來源：2014屆吉林松原油田高中高三上期10月調(diào)研英語卷（解析版） 題型：閱讀理解
Bissel is a small village of the West Sahara. It lies next to a l.5-square-kilometer oasis（綠洲）, from where three days and nights are generally required to go out of the desert. However, before Ken Levin discovered it in 1926, none of the Bissel villagers had ever walked out of the desert. Reportedly, they were not unwilling to leave this barren land. Many had previously tried but failed, always somehow finding themselves back at the oasis after several days of trying to walk out.
When interviewed by Ken Levin, an expert at the British Royal College of Sciences, the villagers explained that no matter which direction they walked it always brought them back to the village.Why couldn’t the Bissel villagers walk out of the desert? Levin was very puzzled. He had, by himself, managed to walk north from the village and reach the nearest town in three and a half days. He decided to carry out an experiment to solve the mystery. He and a Bissel villager called Argutel, would walk out of the desert together. They prepared enough water for a half-a-month journey and two camels. But this time Ken Levin didn't bring his compass. Levin would follow Argutel.
Ten days later, they had walked for about 500 miles but were still in the desert. On the 11th morning, an oasis came into their view. They were back at Bissel. Levin now understood why the Bissel people couldn’t escape the desert. They had no knowledge of the North Star, which had for centuries provided sailors and other travelers with a point of direction. In the desert, if a person goes forward relying only on their senses, they will not be able to travel in a straight line. Rather they will travel in a very large circle and eventually track back to where they began. Levin explained to Argutel the function of the North Star and said, “As long as you rest in the daytime and walk towards the brightest star at night, you would be able to walk out of the desert.” Argutel did as he was told. Three days later, he came to the edge of the desert.
Now in the West Sahara, Bissel has become a bright pearl, where tens of thousands of tourists come every year. Argutel’s bronze statue stands in the center of the town. On its base are the words: __________________________________.
1.Ken Levin asked Argutel to walk to the north in order to ________.
A. prove that people could walk out of the desert see
B. how far away Bissel was to the edge of the desert
C. tell people not to walk in circles
D. show Argutel was a great person
2.According to the passage, Ken Levin ________.
A. knew Argutel before he came to the village
B. came to Bissel to do experiments on behalf of his college
C. became the first man to walk out of the desert from Bissel Village
D. taught Bissel villagers knowledge of the North Star when he first arrived
3.It can be inferred from the passage that ________.
A. Ken Levin didn’t walk south because it would take more days
B. the use of a compass was necessary to walk out of the desert
C. tourism in Bissel has been greatly developed and improved
D. Argutel became the leader of Bissel after his return
4.Which of the following can most probably be found at the base of Argutel’s statue?
A. A new life starts from the fixed direction.
B. Where there is a will, there is a way.
C. A long journey starts with the first step.
D. Two heads are better than one.
查看答案和解析>>
湖北省互聯(lián)網(wǎng)違法和不良信息舉報平臺 | 網(wǎng)上有害信息舉報專區(qū) | 電信詐騙舉報專區(qū) | 涉歷史虛無主義有害信息舉報專區(qū) | 涉企侵權(quán)舉報專區(qū)
違法和不良信息舉報電話：027-86699610 舉報郵箱：58377363@163.com
