2017年高考英语一轮复习Unit5Firstaid课时作业新人教版必修5

Unit 5 First aid

Ⅰ.阅读理解

A

体裁：说明文话题：医学词数：271 时间：6′

As cold season approaches，many Americans will buy a lot of vitamin C and echinacea(紫锥菊)in order to avoid catching a cold.But paying attention to an old piece of advice about having enough sleep every day might be more important.

Research suggests that poor sleep can increase the chance to colds.Studies have shown that poor sleep and a chance to catch a cold go hand in hand，and scientists think sleep plays an important role in the body's defenses.

In a recent study for The Archives of Internal Medicine，scientists followed 153 men and women for two weeks，keeping an eye on their

quality and duration(持续性)of sleep.Then，during a five－day period，they exposed them to cold viruses.Those who slept an average of fewer than seven hours a night，it turned out，were three times as likely to get sick as those who averaged at least eight hours a night.

Sleep and immunity(免疫)，it seems，are tightly linked.Studies have found that mammals that require the most sleep also produce greater levels of disease－fighting white blood cells—but not red blood cells，even though both are produced in bone marrow(骨髓) and stem from the same precursor.And researchers at the Max Planck Institute for

Evolutionary Anthropology have shown that species that sleep more have greater resistance against pathogens(病原体)．

“People who have longer sleep every night，” the Planck

scientists wrote，“appear to be able to strengthen their immune systems and be better protected.”

【语篇解读】随着天气变冷，越来越多的人将会感冒。如何才能在寒冷的

季节避免感冒的侵袭？研究表明，充足的睡眠将会保护你不受感冒的威胁。

1．Which of the following can be the best title of the passage?

A．The Best Way to Avoid Catching a Cold in Winter.

B．The Relationship between Sleep and Immunity.

C．Lack of Sleep Increases the Risk of Catching a Cold.

D．How to Strengthen Your Immune Systems?

答案 C [主旨大意题。通读全文可知本文主要讲述的是充足的睡眠可以减

少得感冒的机会，也就是说缺乏睡眠会增加得感冒的风险。故C可作文章的标题。]

2．From the passage we can infer that ________．

A．vitamin C and echinacea can help resist colds

B．the longer you sleep，the healthier you will be

C．people didn't know the relationship between sleep and colds before

D．people's immunity can be gained mostly from sleep

答案 A [推理判断题。根据短文第一句可知答案。B项没有依据；C项根据But paying attention to an old piece of advice about having enough sleep every day might be more important可排除；D项没有依据。]

3．We can draw a conclusion from the third paragraph that

________．

A．most people sleep less than seven hours a day

B．sleep less may easily lead to some illnesses

C．one should sleep at least seven hours a day

D．sleep is the best way to treat illnesses

答案 B [细节理解题。根据第三段内容可知，从这项研究中可以得出结

论：睡眠少很容易导致疾病。]

4．How does the author express his idea?

A．By using the results of studies.

B．By comparing some numbers.

C．By telling some interesting stories.

D．By referring to some theories.

答案 A [细节理解题。作者为了说明睡眠不足可导致感冒的风险，多次提

到了研究的结果。故答案为A。]