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题型:阅读理解-单选 难度:0.65 引用次数:67 题号:17074165

It might be fun to use your smartphone, but be careful. Too much screen time may be harmful to your health.

First, it is bad for your eyes. A researcher called Sarah Hinkley says the problem comes from the blue light that the screen gives out. Looking at a smartphone for a long time can cause eye strain (劳损), headaches and dry eyes. So it is a good idea to take a break every 15 minutes when you are working at a computer or using a smartphone.

Second, screen use can do harm to children’s brains. A new study shows that using screens too much can affect how children’s brains grow. If children use screens for more than one hour a day, they might have lower levers of white matter in their brains. White matter is the key to the development of language and reading skills. So it is wise to cut down the time of children using all kinds of screens.

Third, using screens too much will affect your sleep. According to a study, about 95% of the people between the age of 13 and 64 use electronics before bed, especially the young people under 20. Doctors say that the light from those electronics at night may make you excited before you go to bed. Then it’s hard for you to get enough sleep. So you’d better turn off smartphones, TVs, and all other screens an hour before your bedtime.

To keep healthy, doctors and researchers strongly advise that you shouldn’t use screens for long hours.

1. What does the underlined word “affect” in Paragraph 3 mean? ________.
A.促进B.宣布C.影响D.计算
2. According to the passage, you can’t sleep well because ________.
A.the screens give out the blue lightB.you use screens too much before bed
C.you have lower levers of white matterD.doctors ask you to use the electronics
3. Which of the following is TRUE according to the passage? ________
A.The blue light can cause eye strain, headaches and dry eyes.
B.White matter is the key to the development of writing skills.
C.95% of the people under the age of 20 use electronics before bed.
D.TV programs can make the people more excited than smartphones.
4. The writer’s main purpose of writing the passage is ________.
A.to show you how to use smartphonesB.to let you take a break every 15 minutes
C.to tell you advantages of using screensD.to ask you not to use screens too much

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【推荐1】①A smile shows that a person is happy. For example, a person may smile when he is pleased with a grade on a test. Or a person might smile if a friend told a funny joke. People smile for many different reasons. But smiles are more than just a way for people to show that they are happy. There are other good reasons to smile often.

②First, it is easier to smile than to show unhappiness. In fact, it only takes 17 muscles (肌肉) to smile. But it takes 43 muscles to show unhappiness. So give the muscles in your face a rest and smile!

③Second, smiles are nice. People may try to look nice on the outside by wearing nice clothes. However, there is a famous saying: _________. That is because it is easy to be around someone who is smiling and happy. Almost no one wants to be around someone who is unhappy all the time.

④Third, smiles are helpful. Both smiling and laughing can quickly spread from one person to another. If one person smiles, people around him want to smile, too. Similarly, when a person laughs, people tend (倾向) to laugh with him. If a person is sad, the best thing to do is to share a smile or laugh. It is the easiest and cheapest way to cheer someone up. Usually nobody would like to turn down the invitation which is offered by a person with a smile.

⑤Finally, smiling and laughing are very good for the body. Even if you are mad or sad. try smiling. You’ll find that it will be hard to stay mad or sad for very long

1. Which of the following sentences can be put in the _______ in Paragraph ③?
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B.If you smile at life, life will smile at you.
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A.B.C.D.
5. What can be the best title for this text?
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【推荐2】As the saying goes, “A smile is the best medicine.” Nothing can treat a sick heart than a warm smile.

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