Questions are based on the recording you have just heard. ___________

单选题Questions are based on the recording you have just heard.
____________

A．Large animals require more food.
B．Large animals have fewer offspring.
C．Large animals need more energy.
D．Large animals have greater difficulty staying warm.

参考答案B

解析:Your reading for today touched on dinosaur fossils from the Mesozoic era, which ended about 65 million years ago. Today we will be discussing the sauropods. They were an extremely successful kind of dinosaur. There's evidence of sauropods in the fossil record for an unusually long time, over one hundred million years. So, why were sauropods so successful? Biologically speaking, sauropods shouldn't have been successful. Large animals like elephants, say, [23] they require much more food and energy and what's _typically is that they usually have fewer offspring than smaller animals. This makes maintaining a population harder.
The largest animals today don't live on land but in the ocean where food is easier to find. A blue whale, for in-stance, can eat up to 8,000 pounds of food a day. And they give birth only once every few years. We also know that body heat, that.., well, large animals can't easily get rid of
excess body heat. But for an oceangoing whale, that's not a problem. For a 100-ton land animal, it can be. [24] For years, we have assumed it was the abundant plant life of the Mesozoic that allowed these giants to thrive. However, we now know that since oxygen levels were much lower in the Mesozoic than we assumed, there was much less plant life for sauropods to eat than we thought. So now, well, we are trying to understand the biology of sauropods, comparing their fossils to get a better idea of how they live. What we've found is that sauropods were experts at conserving energy. They had enormous stomach capacity, the ability to digest food over a long period, converting it to energy at a slower pace, saving it for later.
[25] But you know there's always some guesswork when studying extinct animals. We guess the hypothesis by looking for evidence to support it. Then some questions are answered, which may lead to new questions. Anyhow, I think they are useful in proving the truth. For example, we know sauropods couldn't chew food. Their skulls show they had no chewing muscles. Lots of modem animals, like birds, also can't chew food. But modem animals have an interesting aid for digesting food. They swallow stones, stones that are used to help grind up the food before it's actually digested in the stomach. Now, sauropod fossils are commonly found with smooth stones. But there are studies which now make us not quite sure what these sauropods's tones were used for. It could be they served no real purpose. Other researchers speculate that sauropods swallowed these stones as a source of some the minerals they needed, such as calcium. So the original hypothesis, even though it hasn't been supported, has helped us to make new hypoth-eses, which may eventually lead to the answer.
【预测】选项均为对large animals的表述，结合其中的require，food，have…offspring．use more energy和staying warm可知，本题可能考查大型动物的生存特点。
【解析】B。录音中教授提到，与小型的动物相比，大型动物需要更多的食物和能量，而且典型的是通常他们的后代更少(fewer offspring.．故答案为B。

点击查看答案进入在线模考

你可能喜欢

单选题 ____________

A．Animal populations in the Mesozoic era were smaller than previously believe.
B．Oxygen levels in the Mesozoic era were higher than previously believe.
C．Ocean levels in the Mesozoic era fluctuated more than previously believe.
D．Plant life in the Mesozoic era was less abundant than previously believe.

点击查看答案进入在线模考

单选题 ____________

A．It leads to many new questions.
B．It is very useful to some extent.
C．It hinders the normal study process.
D．It makes the study work more difficult.

点击查看答案进入在线模考

单选题Questions are based on the following passage.
Sending your children to piano or violin lessons in a bid to boost their academic achievement is a waste of money, according to scientists. Although research has shown that youngsters who take music lessons are more likely to be 26 of their class, psychologist Glenn Schellenberg claims this link is 27.
Instead, improved academic performance may be because brighter children from privileged 28 are more likely to learn an instrument, rather than music classes helping to boost their 29."Music may 30 you a bit, but it's also the case that different children take music lessons," said Professor Schellenberg of the University of Toronto, who added that parents' education was the most influential 31 on musicality. "Children who take music lessons come from families with higher incomes, they come from families with more 32 parents, they also do more extracurricular (课外的) activities, they have higher IQs, and they do better at school."
In tests on 167 children who played the piano or other instruments, they found their answer to personality tests could 33 how likely it was for them to continue their music lessons. Those who were more outgoing and conscientious were more likely to continue to play.
"We were 34 by the fact that kids who take music lessons are particularly good students, in school they actually do better than you would predict from their IQ, so 35something else is going on," Professor Schellenberg told the American Association for the Advancement of Science(AAAS. annual conference in Boston. "So we thought that personality might be the personality."
第26题__________

A．backgrounds
B．change
C．decrease
D．displayed
E．educated
F．emotional
G．factor
H．fortunately
I．intelligence
J．misleading
K．motivated
L．obviously
M．predict
N．status
O．top

点击查看答案进入在线模考

hot热门搜索

你可能喜欢

延伸阅读