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finally giveing some 13 to those martinis if you want to prevent first cancer，and then heart disease． Even for the youthful working person who has never been sick a day in his life,who is 14 excellent health．a good look at all health habits and at work and home environments may suggest changes that will 15 him in the future．
练习：
1.A know B have known C need know D need to know
2.A with B in C on D at
3.A diet B meals C food D dinner
4.A use B devote C spend D take
5.A on B in C with D about
6.A if B whether C either D neither
7.A To complete B Completing C Completion D To be completed
8.A as B for C on D about
9.A Unless B Once C If D Although
10.A around B with C about D 0n
11.A work B task C job D place
12.A on B with C after D by
13.A thought B idea C thinking D talk
14.A for B in C with D on
15.A reap B harvest C benefit D lead
+第十五篇
Life Expectancy in the Last Hundred Years
A hundred years ago，life expectancy in developed countries was about 47: in the early 21st
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century, men in the United States and the United Kingdom can expect to live to about 74. Women to about 80, and these _____l_____ are rising all the time. What has brought _____2_____ these changes? When we look at the life_____3_____of people l00 years ago, we need to look at the greatest_____4_____of the time. In the early 20th century, these were the acute and often _____3_____ 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_____6_____world these diseases are far_____7_____today, and in some cases have almost disappeared. A number of_____8_____have led to this: improvements in sanitation and hygiene, the discovery and use of antibiotics, which_____9_____bacterial diseases much less dangerous, and vaccinations_____l0_____common diseases._____11_____, 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_____l2_____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_____l3_____by viruses, such as influenza and AIDS l. Of course, cancer is a huge killer as well. In most cases these diseases affect_____l4_____people, but there are worrying trends in the developed world with problems such as obesity_____l5_____more heart disease and illnesses such as diabetes at younger ages.
The killers today can be classed as \，which means that it may be possible to halt their progress.
词汇：
Expectancy n．预期
Acute aaj．(疾病)急性的 Infectious adj．传染性的 Smallpox n.天花
Sanitation n．环境卫生 Hygiene n．个人卫生 Antibiotic n．抗生素 Bacterial adj．细菌性的 Vaccination n．种痘，接种
Preserve vt．保藏，防止(食物)腐烂 Nutrition n．营养
Chronic aaj．(疾病)慢性的 Stroke n．中风 Virus n．病毒
Influenza n．流行性感冒 Trend n．趋势，倾向 Obesity n．肥胖
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Diabetes n．糖尿病 Halt vt．使．．．停止
注释：
Acquired Immune Deficiency Syndrome(AIDS)：艾滋病，后天性免疫缺乏综合症
练习： ，
1． A ages B years C lives D countries 2． A in B about C to D with 3． A length B time C duration D span 4． A people B killers C invention D nation 5． A more B less C high D highly 6． A developed B less developed C undeveloped D developing 7． A more deadly B deadly C 1ess deadly D fatal 8． A improvements B factors C jobs D measures 9． A makes B causes C make D from 10． A against B for C to D cause 11． A And B Therefore C In addition D Nevertheless 12． A when B yet C however D while 13． A spread B affected C produced D created 14． A poor B weak C older D young 15． A and B leading to C from D with
答案与题解：
1. A通过上下文可知此处应为\年龄\
2. B bring about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 brought with these changes才符合语法，但意思就不符合文章了。
3. D life span是一个固定搭配，意为寿命。
4. B从下一句可以看出此处应指那些不治之症。
5. D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，所以and后面也不应用比较级。
6. A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。
7. C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.
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8. B 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.
9. C注意这里的which不是非限制定语从旬中指代前面l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后的动词不用三单形式。cause没有这样的语法搭配。
10.A该选项为固定搭配，意为对某种疾病的预防接种。
11.C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.
12.D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。
13.A 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。
14.C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。
15.B 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。
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