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suffer when we try to get by with too little shuteye. So it's fortunate that our bodies do such a good job
of waming us when it's time to hit the sack.
Like humans, other animals also take time out to rest. You've probably seen a lion dozing at the zoo,
or maybe watched our dog snooze away lying in its bed. In fact, sleep is a necessity for every animal that's
ever been studied.
How long animals sleep, though, varies widely. Elephants and giraffes sleep only about 2 to 4 hours a
day, while bats may nod off for up to 20 hours. Ducks sleep together, and the birds on the edge of the group
sleep with the outside eye open and half of their brain awake-probably to keep watch while the other half of
their brain snoozes. Some birds may even sleep while flying. The fact that all animals make time for sleeping,
even under very dangerous situations, suggests that sleep is very important. And indeed, some facts suggest
that sleep is important for leaming and forming permanent memories.
But sleep may also be primarily a way for animals to save energy and stay out of harm. This may help
explain why meat-eating creatures sleep more than herbivores, which are animals that live only on plants.
Herbivores, like cows and zebras, need to spend more time searching for and grazing on food than meat eaters
do, such as lions and other big cats. So a big cat might be better off sleeping for a while after it eats, rather
than prowling around and risking injury.
But that's just a guess. Scientists need to study other animals as well before they can fully understand the
benefits (好处) of sleep and know which benefits are most important for a particular species (物种).
One thing is certain: enough sleep is important to health and learning. So give in when a strong wish to
sleep hits, and catch plenty of ZZZs.
B. to drink something
C. to get up
D. to go to sleep
B. if you want to sleep in class, fall asleep immediately
C. you are easy to give in if you have plenty of sleep
D. if you have a strong wish to sleep, you are perhaps ill
B. how animals sleep in the open air
C. why animals need sleep
D. when animals feel sleepy
It’s every student’s bad dream: exam time. During the last three days of the term, we had six exams.
My easiest exam was math. All of its questions were from earlier exams.
The biology exam was hard. At first, I thought I would fail it. It asked about lots of things we never studied in class, though we could use our textbooks. And there wasn’t enough time to check every question. I guessed at many of them. But my teacher said that I did well in it.
In the career planning and computer applications（职业规划与电脑应用）exam, we had a lot to do: a PowerPoint presentation, a book report and a class evaluation（评价）. I felt like I needed more time, but some of my classmates didn’t think so. They just quickly wrote down some answers and then played games.
I don’t think I did very well in the English exam. We had to write an essay（passage）about books we have read in class. But I didn’t study hard enough.
At our school, we can“test out”of some classes. That means students can study by themselves and then take exam. If they pass, they don’t have to take that class. I tested out in both computer and health classes.
Studying for those exams was terrible. Those classes would go on for six months, but I had to teach myself everything in three weeks. Also, I had to do three big projects at the same time. I watched no TV for almost three weeks! I am so glad it is over, and now it’s the summer holiday.
For my classmates, it will be two and a half months for fun without school or homework. But I am a Chinese, and you know what Chinese parent do with their kid’s free time: more homework.
1. How did the writer pass the biology exam?
A. He checked the biology exam paper carefully.
B. Because a lot of things had something to do with textbooks.
C. Although the writer didn’t have enough time to examine every question, he guessed on many of them correctly.
D. His teacher taught well.
2. The underlined phrase“test out”means ___________.
A. 免修 B. 必修
C. 选修 D. 重修
3. Why did the writer test out the computer class? Because _____________.
A. he spent more time on it and studied hard by himself
B. the teacher said he did it well
C. some classmates didn’t pay attention to it at all.
D. it was quite easy for him to study and play it.
4. The underlined phrase“go on for”is that ______________.
A. last B. spend
C. take D. cost
5. The main idea of the passage is that __________________.
A. it tells us what the “test out”exam is
B. if you study hard, you won’t fail exams
C. there are some differences among different kinds of exams
D. it’s not easy for students to take exams
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