Question

【題目】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(化學(xué)物質(zhì)) 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(測(cè)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 at the very least turning down your screen as much as possible.

根據(jù)材料內(nèi)容選擇最佳答案。

【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】How may electronic products influence people’s sleep?

A. Make our brains more active.

B. Make our body weak.

C. Lower our brains’ chemicals that help sleep.

D. Change our body clocks.

【4】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

【5】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.

Answer 1

【答案】

【1】B

【2】A

【3】C

【4】D

【5】C

【解析】

試題分析：短文大意：在當(dāng)今世界，電子產(chǎn)品很受歡迎。但睡眠專家說，手機(jī)或iPad之類的電子產(chǎn)品使大腦更活躍，進(jìn)而影響人的睡眠。研究人員發(fā)現(xiàn)，一些電子產(chǎn)品在夜間人造光可以減少大腦的化學(xué)物質(zhì)，幫助睡眠。對(duì)于學(xué)生在夜間使用電腦的研究得到了類似的結(jié)果。夜間使用電腦不僅會(huì)導(dǎo)致失眠，但也增加肥胖的風(fēng)險(xiǎn)，糖尿病和其他疾病。為了安全起見，研究人員建議我們?cè)谒�覺前少用電腦，或者至少盡可能地關(guān)閉屏幕。

【1】B細(xì)節(jié)理解題。根據(jù)短文的第一段最后一句“more than 90% of Americans regularly use a computer or some other kinds of electronic products in the hour before bed.”可知，電子產(chǎn)品很受歡迎，故答案為B。

【2】A細(xì)節(jié)理解題。根據(jù)短文中的句子In the study， the researchers let volunteers read， play games and watch movies on a tablet for different time while measuring(測(cè)量) how much light their eyes received.可知，研究人員讓志愿者閱讀，玩游戲，在不同的時(shí)間片觀看電影，沒有聽音樂，答案為A。

【3】C細(xì)節(jié)理解題。根據(jù)短文第二段中的句子Researchers are finding that man-made light from some electronic products at night may reduce the brain chemicals(化學(xué)物質(zhì)) that help sleep.可知，一些電子產(chǎn)品在夜間人造光可以減少大腦的化學(xué)物質(zhì)，幫助睡眠。故答案為C。

【4】D詞意猜測(cè)題。根據(jù)前面的句子Studies of students using computers at night have got the similar results. 對(duì)于學(xué)生在夜間使用電腦的研究得到了類似的結(jié)果。夜間使用電腦不僅會(huì)導(dǎo)致失眠，但也增加肥胖的風(fēng)險(xiǎn)，糖尿病和其他疾病。故答案為D。

【5】C細(xì)節(jié)理解題。根據(jù)短文最后的句子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.可知，為了安全起見，研究人員建議我們?cè)谒�覺前少用電腦，或者至少盡可能地關(guān)閉屏幕。故答案為C。