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Daming hasn't done much exercise _______ he got his computer.

A. when B. if C. though D. since

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Have you ever had trouble sleeping in a new place?

Lots of people do. And now researchers from Brown University in Rhode Island think they know why. They found that one-half of the brain "remains more awake" than the other half when people are trying to sleep in a new place.

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根據(jù)材料內容選擇最佳答案，并將其標號填入題前括號內。

1. How many times did the researchers measure brain waves for 35 volunteers?

A. Once. B. Twice. C. Three times. D. Four times.

2. The researchers found during the first deep-sleep period.

A. the brain waves remained the same

B. the brain activity helped with sleep

C. the right half of the brain kept "watch"

D. the left half of the brain was more active

3. Which of the following is one of the questions that remain?

A. Whether the new bed keeps you from sleeping.

B. How you have trouble sleeping in a new place.

C. Why the brain activity is always on the left half.

D. What people can do when they can't sleep well.

4.The underlined word "calming" has the closest meaning to" ".

A. pleasing B. different C. serious D. strange

5.What is the text mainly about?

A. What we will have to do to sleep well.

B. How researchers measure brain waves.

C. Who doesn't sleep well in a new place.

D. Why it's harder to sleep in a new place.

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