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Throughout history man has had to accept the fact that all living things must die. But people now live longer than they【C1】_____
Throughout history man has had to accept the fact that all living things must die. But people now live longer than they【C1】_____
admin
2013-04-25
62
问题
Throughout history man has had to accept the fact that all living things must die. But people now live longer than they【C1】______. Yet, all living things still show the【C2】______of aging, which will eventually【C3】______death.
Aging is not a disease, but as a person passes maturity(成熟期), the cells of the body and the 【C4】______they form do not function as well as they【C5】______in childhood and teenage years. The body provides less【C6】______against disease and is more【C7】______to have accident.
A number of related causes may【C8】______aging. Some cells of the body have a fairly long life, but they are not【C9】______when they die. As a person ages, 【C10】______of brain cells and muscle cells decreases. 【C11】______body cells die and are replaced by new cells. In an aging person the【C12】______cells may not be as workable or as capable【C13】______growth as those of a young person.
Another【C14】______in aging may be changes within the cells【C15】______. Some of the protein chemicals in cells are known【C16】______with age and become less elastic(有弹性的). This is why the skin of old people wrinkles(皱纹) and【C17】______. This is also the reason why old people 【C18】______in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as DNA and RNA, store and【C19】______information that the cells need. Aging may affect this【C20】______and change the information – carrying molecules so that they do not transmit the information as well.
【C2】
选项
A、function
B、effect
C、affect
D、sign
答案
B
解析
根据下文中的定语从句所表示的意义进行判断,这里所填入的单词应该表示“衰老的结果”这一意义。effect意为“结果、影响”,正是此意。function“功能、机能、作用”;affect“影响、感动”,是动词;sign“标记”。解题时要注意effect和affect拼写只相差一个字母,但effect是名词而affect是动词。
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