Question

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

Researchers found that man-made light from some electronic products at night might reduce the levels of the brain chemicals that help sleep. The researchers showed that sitting in the light from tablets clearly reduced the levels of the chemicals which manage our body clocks and play a great 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 how much light their eyes received. They found that sitting for two hours before a bright tablet at night reduced the levels of the chemicals by about 22%.

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

To be on the safe side, the researchers advise us to use computers less before bed, or turn down our screens low.

【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】How many electronic products influence people's sleep?

A.By making our brains more tired.B.By making our bodies weak.

C.By reducing the levels of the brain chemicals that help us sleep.D.By changing our body clocks.

【3】What does the underlined word "that" refer to?

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 do the researchers advise us to do to have a good sleep?

A.Learn to use smartphones or iPads.B.Watch some relaxing TV programs.

C.Turn down the screens low.D.Try to sleep earlier than before.

Answer 1

【答案】

【1】B

【2】C

【3】D

【4】C

【解析】

在當今社會，很多人睡前都會使用手機或其他電子產(chǎn)品，這嚴重影響了人們的睡眠。本文通過幾個研究，向人們展示電子產(chǎn)品是如何影響睡眠的以及其危害，并呼吁大家合理使用電子產(chǎn)品。

【1】推理判斷題。根據(jù)“But according to a latest survey, more than 90% of Americans usually use a computer or some other kinds of electronic products in the hour before bed.”可知研究表明，90%的美國人通常在睡前使用電腦或電子產(chǎn)品，因此可推測電子產(chǎn)品是很流行的；根據(jù)“Such electronic products make the brain more active, and then influence people's sleep.”可知電子產(chǎn)品會使大腦興奮，影響睡眠，A選項“美國人沒有得到足夠的睡眠”并不能根據(jù)第一段推測出，C選項“大腦夜里變得活躍”不符合第一段含義；D選項沒有在文中提及。故選B。

【2】細節(jié)理解題。根據(jù)“Researchers found that man-made light from some electronic products at night might reduce the levels of the brain chemicals that help sleep.”可知電子產(chǎn)品的人造光會降低大腦中幫助睡覺的化學物質(zhì)的量。故選C。

【3】詞義推斷題。根據(jù)“Studies of students using computers at night have got the similar results.”可知學生夜里使用電腦的研究結(jié)果與上一段的研究結(jié)果一致，然后本段介紹了夜里使用電腦產(chǎn)品帶來的危害，that指代的是using computers at night。故選D。

【4】細節(jié)理解題。根據(jù)“To be on the safe side, the researchers advise us to use computers less before bed, or turn down our screens low.”可知研究人員建議盡量在睡前少用電腦或者把屏幕調(diào)低。故選C。