题目内容

【题目】单句语法填空(每小题0.5分,共5分)

1. You can ask anyone for help. ________ here is willing to lend you a hand.

2. Niki is always full of ideas,but ________ is useful to my knowledge.

3. A few hours earlier,Id been at home in Hong Kong,with ________ (it)choking smog.

4. The quality of education in this small school is better than ________ in some larger schools.

5. The meeting will be held in September,but ________ knows the date for sure.

6. The research group produced two reports based on the survey,but ________ contained any useful suggestions.

7. How would you like ________ if you were watching your favorite TV program and someone came into the room and just shut it off without asking you?

8. To warm himself,the sailor sat in front of the fire rubbing one bare foot against ________.

9.—When shall I call,in the morning or afternoon?

—________. Ill be in all day.

10. Raise your leg and let ________ stay in the air for seconds.

【答案】

1.Everyone/Everybody 2.none 3.its 4.that 5.nobody

6.neither 7.it 8.the other 10.Either 10.it

【解析】略

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【题目】Passage 4(2017·北京卷)

Every animal sleeps, but the reason for this has remained foggy. When lab rats are not allowed to sleep, they die within a month. 71

One idea is that sleep helps us strengthen new memories. 72 We know that, while awake, fresh memories are recorded by reinforcing (加强) connections between brain cells, but the memory processes that take place while we sleep have been unclear.

Support is growing for a theory that sleep evolved so that connections between neurons(神经元) in the brain can be weakened overnight, making room for fresh memories to form the next day. 73

Now we have the most direct evidence yet that he is right. 74 The synapses in the mice taken at the end of a period of sleep were 18 per cent smaller than those taken before sleep, showing that the connections between neurons weaken while sleeping.

If Tononis theory is right, it would explain why, when we miss a nights, we find it harder the next day to concentrate and learn new information our brains may have smaller room for new experiences.

Their research also suggests how we may build lasting memories over time even though the synapses become thinner. The team discovered that some synapses seem to be protected and stayed the same size. 75 You keep what matters, Tononi says.

A. We should also try to sleep well the night before.

B. Its as if the brain is preserving its most important memories.

C. Similarly, when span>people go for a few days without sleeping, they get sick.

D. The processes take place to stop our brains becoming loaded with memories.

E. Thats why students do better in tests if they get a chance to sleep after learning.

F. Sleep is the price we pay for learning, says Giulio Tononi, who developed the idea.

G. Tononis team measured the size of these connections, or synapses, in the brains of 12 mice.

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