[单项选择]Imagine going to sleep in October and waking up in May! Well, marmots and ground squirrels stay warm by sleeping all winter. All this time, they do not wake up once. This special kind of sleep is called hibernation. During this sleep, the heart slows down, and the animal breathes more slowly, it doesn’t move around, so it uses less energy.
Animals like the marmot and the ground squirrel inhabit the coldest parts of the world. They need special talents to survive in these frigid places. Their furry coats keep them snug when the temperature falls below zero. It often gets this cold in the Arctic, a land that is just below the North Pole.
Before the long winter, some animals eat and eat. After a while, they grow very fat. When the winter comes, they live on the fat saved up in their bodies. Layers of fat keep an animal warm.
Arctic animals also have other ways to beat the cold. Rabbits in the Arctic, for example, have very small ears. Small ears keep heat in, while big ears
A. to be very fat
B. to have small ears
C. to eat green grass
D. to have thick and soft hairs

[填空题]Going to Sleep When One Feels Sleepy

[单项选择]Imagine waking up and finding the value of your assets has been halved. No, you’re not an investor in one of those hedge funds(对冲基金) that failed completely. With the dollar slumping to a 26-year low against the pound, already-expensive London has become quite unaffordable. A coffee at Starbucks, just as unavoidable in England as it is in the United States, runs about $8.
The once all-powerful dollar isn’t doing a Titanic against just the pound. It is sitting at a record low against the euro and at a 30,year low against the Canadian dollar. Even the Argentine peso and Brazilian real are thriving against the dollar.
The weak dollar is a source of humiliation (屈辱), for a nation’s self-esteem rests in part on the strength of its currency. It’s also a potential economic problem, since a declining dollar makes imported food more expensive and exerts upward pressure on interest rates. And yet there are substantial sectors of the vast U.S. economy — from giant companies like Coca-Col
A. They treat the dollar with a little respect.
B. They try to win in the weak=dollar gamble.
C. They vacation at home rather than abroad.
D. They treasure their marriages all the more.