During the daytime,many people are busy using their cell phones. They only have time to charge them at night when they are asleep. But scientists have warned that having a glowing smartphone in your b 题目和参考答案——青夏教育精英家教网—

题目内容

During the daytime,many people are busy using their cell phones. They only have time to charge (充电) them at night when they are asleep. But scientists have warned that having a glowing smartphone in your bedroom at night could not only affect your sleep,it could also make you fat.

When darkness falls,our bodies begin to produce a hormone (荷尔蒙) called melatonin (视黑激素) . K helps our metabolism (新陈代谢) so that our bodies can change food and drink into energy. When the sun rises,melatonin reduces. This light-dark cycle is good for our health.

But if you charge your phones when you are asleep,the phone releases blue light. Although it is not bright enough to light up a room,it can affect your sleep. Therefore,it slows down your metabolism and influences your body to digest (消化) food. This may make you fat.

"Blue light is bad for health because it keeps the mind buzzing," Simon Kyle,a sleep scientist at Manchester University,told the Daily Mail. And there is strong scientific data to show the connection between sleep interference (干扰) and people's health.

Earlier this year,leading scientists from universities including Oxford,Cambridge and Harvard,warned that a lack of sleep could cause serious problems,such as cancer,heart disease and obesity.

Kyle suggested turning off smartphones and desktop computers a few hours before going to bed. This helps to reduce people's exposure (暴露) to artificial (人工的) light.

53. The passage shows that .

A. it's better to charge phones during the daytime

B. using smartphones can make you become fat

C. using smartphones can affect your eyesight

D. charging a smartphone in your bedroom at night may make you fat

54. What does the underlined word "It" in Paragraph 2 refer to?

A. Melatonin. B. Body.

C. Darkness. D. Food.

55. From the passage,we can learn the blue light from the phones can.

A. affect our sleep

B. slow down our metabolism

C. influence our body to digest food

D. All of the above.

53. D 54. A 55. D

[阅读D篇短文大意]文章告诉我们，晚上睡觉时应远离正在充电的手机，因为手机充电时发出的蓝光不仅会影响我们的身体健康，还可能会使我们变胖。

53. D根据第一段最后一句可知答案为D.

54. A根据第二段第一句可知It指代的是melatonin ,故选A.

55. D根据第三段的内容可知答案为D.

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B. He argued with his parents.

C. He had trouble in his studies.

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A. Write a letter. B. Make a phone call.

C. Have a talk.

The dogsled (狗拉雪橇) race was about to begin. Dogs of Julie's team were lined up at the starting gate. Julie stood behind them. The air was very cold. Other teams were lined up,too,and the dogs were excited. At exactly ten o’clock,she and the other racers shouted, " Mush!" The dogs knew well what it meant. They started running and the race began!

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A. Letter-writing. B. Story-telling.

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B. ordering her dogs to keep on running

C. letting others know that they were going to win

D. telling others that she was the boss of her dogs

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C. Julie had been trained for months for this dogsled race.

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听第11段对话，回答第11至12小题。

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