单选题 Life Expectancy in the Last Hundred Years

A hundred years ago, life expectancy in developed countries was about 47; in the early 21st century, men in the United States and the United Kingdom can expect to live to about 74, women to about 80, and these (51) are rising all the time. What has brought (52) these changes? When we look at the life (53) of peoplel00 years ago, we need to look at the greatest (54) of the time. In the early 20th century, there were the acute and often (55) infectious diseases such as smallpox. Many children died very young from these diseases and others, and the weak and elderly were always at risk.
In the (56) world these diseases are far (57) today, and in some cases have almost disappeared A number of (58) have led to this: improvements in sanitation and hygiene, the discovery and use of antibiotics, which (59) bacterial diseases much less dangerous, and vaccinations (60) common diseases. (61) , people's general health has improved with improvements in our general environment: cleaner air, better means of preserving food, better and warmer housing, and better understanding of nutrition.
Genetically, we should all be able to live to about 85 but (62) people do live longer today, there are still some big killers around that are preventing us from consistently reaching that age. The problems that affect people today are the more chronic illnesses, such as heart disease and strokes, and those (63) by viruses, such as influenza and AIDS. Of course, cancer is a huge killer as well. In most cases these diseases affect (64) people, but there are worrying trends in the developed world with problems such as obesity (65) more heart disease and illnesses such as diabetes at younger ages.
The killers today can be classed as "lifestyle diseases", which means that it may be possible to halt their progress.

单选题 A. ages B. years C. lives D. countries

A
B
C
D

【正确答案】 A

【答案解析】通过上下文可知此处应为“年龄”。

单选题 A. in B. about C. to D. with

A
B
C
D

【正确答案】 B

【答案解析】bring abo,Jt意思是“带来”，bring in意为赚取，实现(一定利润)，没有bring to这个短语，如果用with，此句话必须变成what has it brolJght with these changes才符合语法，但意思就不符合文章了。

单选题 A. length B. time C. duration D. span

A
B
C
D

【正确答案】 D

【答案解析】life span是一个固定搭配，意为寿命。

单选题 A. people B. killers C. invention D. nation

A
B
C
D

【正确答案】 B

【答案解析】从下一句可以看出此处应指那些不治之症。

单选题 A. more B. less C. high D. highly

A
B
C
D

【正确答案】 D

【答案解析】本句举了天花的例子，下一句指出很多孩子死于这些病，所以此处应为一个表示严重的词。high是形容词，不能修饰后面的形容词。acute不是比较级，and后面也不应用比较级。

单选题 A. developed B. less developed C. undeveloped D. developing

A
B
C
D

【正确答案】 A

【答案解析】本句后部分说在一些国家这些病已经消失，通过常识得知应该是发达国家。

单选题 A. moredeadly B. deadly C. lessdeadly D. fatal

A
B
C
D

【正确答案】 C

【答案解析】本句后部分说在一些国家这些病已经消失，整段都在说明情况好转，故选C。

单选题 A. improvements B. factors C. jobs D. measures

A
B
C
D

【正确答案】 B

【答案解析】冒号后面列举的内容不能统一用其他几个词概括，只能用factor。

单选题 A. makes B. causes C. make D. cause

A
B
C
D

【正确答案】 C

【答案解析】注意这里的which不是非限制定语从句中指代前而一句话的作用，而是指代前面两项内容：卫生的改善和抗生素的发明使用，所以which后的动同不用三单形式。cause没有这样的语法搭配。

单选题 A. against B. for C. to D. from

A
B
C
D

【正确答案】 A

【答案解析】该选项为固定搭配，意为对某种疾病的预防接种。

单选题 A. And B. Therefore C. In addition D. Nevertheless

A
B
C
D

【正确答案】 C

【答案解析】前面说的是对疾病的防范和控制加强，后面说的是整体环境的改善，两者为并列关系，但是And在书面语中不能这样使用，所以只能选in addition。

单选题 A. when B. yet C. however D. while

A
B
C
D

【正确答案】 D

【答案解析】整句话的意思是：从基因角度看，人都能活到85岁，但是虽然现在人们寿命确实比以前长了，仍然有一些疾病使得我们不能都活到那个岁数。所以此处应该填一个转折副词。

单选题 A. spread B. affected C. produced D. created

A
B
C
D

【正确答案】 A

【答案解析】those指代流感和艾滋病等靠病毒传播的疾病，those后面的动词是过去分词作定语。spread的过去分词与原形相同。

单选题 A. poor B. weak C. older D. young

A
B
C
D

【正确答案】 C

【答案解析】本句最后指出一些病越来越年轻化，所以此处应选择younger的反义词。

单选题 A. and B. leading to C. from D. with

A
B
C
D

【正确答案】 B

【答案解析】obesity是心脏病和糖尿病年轻化的重要原因，它和心脏病、糖尿病不是并列关系，而是因果关系，所以选择leading to，现在分词作结果状语。