2020高考英语一轮精选练Unit2Robots含解析新人教版选修7-精装版
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2020高考英语一轮精选练Unit2Robots含解析新人教版选修7-精装版
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2 / 13 【精选】20xx最新高考英语一轮精选练Unit2Robots含解析新人教版选修7
李仕才
一、阅读理解.
Vitamin B could help lessen the effects of the most
dangerous type of air pollution, according to a new study
published recently. In the first study of its kind, a team
of international researchers looked at the damage caused by
one of the pollutants that have the most severe impact on
health: PM2.5.
Particulate matter, or PM, is a type of air pollutant
consisting of small particles of different sizes. PM2.5 has
a diameter of fewer than 2.5 micrometers, about 30 times
smaller than a human hair. These particles are so small
that they can go into our respiratory system(呼吸系统),
resulting in lung and systemic inflammation(炎症) and
stress.
The team found that something as simple as a daily
vitamin B supplement could potentially reduce the impact of
the tiny particles on the human body, although they
stressed that the research was in its early stages and the
sample size was small.
3 / 13 For this study, 10 volunteers were initially exposed to
clean air and given a placebo(安慰剂) to check their
responses. The group then took another placebo for four
weeks before being exposed to heavily polluted air from
downtown Toronto, where an estimated 1，000 cars pass every
hour. The bad air was delivered to the volunteers through
an “oxygentype” face mask. The experiment was then
repeated, with each volunteer taking a B vitamin supplement
daily made up of 2.5 mg of folic acid, 50 mg of vitamin B6,
and 1 mg of vitamin B12. B6 can be found in liver, chicken
and nuts, and B12 in fish, meat, eggs, milk and some
cereals.
The researchers found that four weeks of B vitamin
supplements reduced the damage of PM2.5 exposure by 28%－76%. The results highlight how prevention at an individual
level could be used to fight the harmful effects of PM2.5.
【解题导语】 本文是一篇说明文.吸入人体内的PM2.5(细颗粒物)会导致疾病.不过，研究发现维生素B在一定程度上能降低PM2.5的危害.
1．Why is PM2.5 harmful to our health?
A．It pollutes and poisons the air.
B．It is too much to be got rid of.
C．It carries viruses and diseases.
D．It is easily breathed in and damages our body.
4 / 13 D 解析：细节理解题.根据第二段中的“These particles are so
small...inflammation(炎症)and stress.”可知，PM2.5(细颗粒物)很小，能进入我们的呼吸系统，导致肺部和全身炎症.
2．What can we infer from Paragraph 3?
A．The process of the research was not scientific.
B．This kind of research has been done many times.
C．Further studies are needed to confirm their findings.
D．Vitamin B is hard to obtain in people’s daily life.
C 解析：推理判断题.根据第三段中的“although they stressed
that the research was in its early stages and the sample
size was small.”可知，该项研究处于初级阶段且样本规模小，因此还需要更多的研究来证明研究团队的发现.
3．What is the text mainly about?
A．International researchers have a new finding.
B．Vitamin B could reduce the damage of PM2.5.
C．Particulate matter does great harm to our health.
D．Emission control and regulation are badly needed.
B 解析：主旨大意题.文章第一段和第二段谈到PM2.5的定义以及PM2.5的危害；第三到五段告诉我们维生素B能降低PM2.5的危害.所以B项最能概括文章主旨.
4．The new study was probably published ___________ ．
A．in a science journal
B．on a government website
C．in a fashion magazine
D．in a medical textbook
5 / 13 A 解析：推理判断题.该文的内容为科学研究发现，很可能出自科学期刊.所以A项正确.
二、单句语法填空
1.The escaped prisoner， ___________ （alarm）， looked up
and stared in the direction where the noise came from.
答案：alarmed
2.Marriages based on money rather than love are bound
___________ （end） in divorce sooner or later.
答案：to end
4.The majority of students were ___________ favour of the
suggestion that they go to picnic the next day.
答案：in
5.（20xx·
答案：aside
答案：that
7.If ___________ （leave） alone outside， dogs and cats
can be very smart in their search for warm shelter.
答案：left
8.In September 1939， Britain declared war ___________
German after Germany invaded Poland.
答案：on
9.He expressed a strong desire that measures ___________
（take） to stop pollution.
