In today’s world, sleep experts say that for a better night’s rest, Americans should turn off their smartphones or iPad before sleeping. Such electronic products make the brain more active, and then influence their sleep. But according to a latest survey, more than 90% of Americans regularly use a computer or some other kinds of electronic products in the hour before bed.

Researchers are finding that man-made light from some electronic products at night may reduce the brain chemicals(化学物质) that help sleep. The researchers showed that sitting in the light from computer tablets clearly lowered levels of the chemical which manages our body clocks and plays a role in the sleep cycle.

In the study, the researchers let volunteers read, play games and watch movies on a tablet for different time while measuring(测量) how much light their eyes received. They found that two hours of sitting before a bright tablet screen at night reduced the sleep chemical levels by about 22%.

Studies of students using computers at night have got the similar results. And researchers say that may not only cause sleeplessness, but also raise the risk of obesity(肥胖症), diabetes(糖尿病) and other diseases.

To be on the safe side, the researchers advise us to use computers less before bed, or at the very least turning down your screen as much as possible.

1. What can we learn from the first paragraph?

A. Americans don’t get enough sleep.

B. Electronic products are very popular.

C. The brain becomes more active at night.

D. Sleep experts never use smartphones.

2.The volunteers in the study did the following things EXCEPT _____.

A. listening to music

B. playing computer games

C. watching movies

D. reading electronic books

3. The underlined word “that” probably means ____ in the passage.

A. making a survey about sleep

B. using smartphones in the daytime

C. sitting in a bright room

D. surfing the Internet at night

4.What does the passage tell us to do to have a good sleep?

A. Learn to use smartphones or iPad.

B. Watch some relaxing TV programs.

C. Turn down the screen to the lowest.

D. Try to sleep earlier than before.

阅读短文,根据短文内容及首字母提示,在空白处填入一个适当的单词

Do you know the story of Snow White? Well, she was the prettiest girl in the kingdom! But the queen wanted to kill her. So she was taken to the forest by a servant. The servant didn’t kill her but let her run away. The Snow White ran to the forest and home of seven little dwarfs. She 1. k____ on the door, and wanted to go into the room. But nobody 2.a_____ . He 3.w_____ a moment outside the door .It was quiet inside .So she 4.p______ the door gently(轻轻地). She found that that there were seven clean and tidy beds in the room. At that moment, she was tired and 5.h_____. So she took a piece of cake and soon fell 6.a_____ in a bed. In the evening, seven little dwarfs came back. At first, they didn’t7.n______ the girl lying in bed. After the girl woke up, she wanted to 8.r____ out of the house .But seven little dwarfs saw her, and said ,“You’re welcome to hide here at our house!” The Snow White was very happy

But the ugly queen found her! She dressed up like an old beggar woman and gave Show White an enchanted apple. She took one bite and fell into a deep sleep. The little dwarfs cried because they couldn’t awaken Snow White. So the dwarfs put her in a glass case. One day, a handsome prince came by and awakened Snow White with a magic kiss. Snow White was so happy,and all the dwarfs yelled “Hooray!” And she and the prince got9.m _______the next day.

Finally, they10. r_____ to their home in the Kingdom together.

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