Question

Deep sleep is important. It helps us keep a good memory. But as we grow older, our sleep and memory become_________. How can older adults maintain(保持) deep sleep and strong memories?

A new study shows that one _______way is to listen to a kind of sound called "pink noise". It is the sound of falling rain, blowing wind and so on. It's called pink noise because it sits_________white noise and red noise on the audio spectrum(音频频谱) .

In the study, scientists _______thirteen adults above 60 years old to spend two nights in a sleep lab. Both nights, the participants (参与者) took a memory test and went to bed wearing headphones. The next morning, they were tested again after_________up.

One of the nights,_______was played through the participants' headphones. The other night, however, pink noise was played.

Here are the results. When participants slept with pink noise on, they had_______periods of deep sleep. They also performed three times better on the memory test the next morning than they_______after sleeping in_________.

However, because the study was very small, scientists still need to do more studies to see how ________pink noise is for people's sleep and memory. Anyway, it is amazing, isn't it?

1.A.clearer B.darker C.worse D.better

2.A.easy B.cheap C.crazy D.quiet

3.A.opposite B.without C.between D.beyond

4.A.forced B.invited C.reminded D.advised

5.A.looking B.staying C.making D.waking

6.A.anything B.nothing C.everything D.something

7.A.longer B.shorter C.higher D.lower

8.A.are B.did C.were D.do

9.A.fear B.trouble C.order D.silence

10.A.awful B.grateful C.helpful D.careful

Answer 1