[单项选择]Throughout history man has had to accept the fact that all living things must die, hut people now live longer than they used to. Yet, all (62) things still show the effect of aging, which will eventually (63) death. The body and the (64) , they do not function as well as they (65) in childhood and adolescence(青春期). The body provides less (66) against disease and is more prone(易于……的) (67) accident.
A number of related causes may (68) to aging. Some cells of the body have a (69) long life, but they are not (70) when they die. As a person ages, (71) of brain cells and muscle cells decreases. Other body cells did and are replaced by new cells. In an aging person the (72) cells may not be as viable(能生存的) or as capable (73) growth as those of a young person.
Another factor in aging may be changes within the cells (74) Some of the prote
A. the amount
B. any amount
C. the number
D. a number

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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 (67) . Yet, all living things still show the (68) of aging, which will eventually (69) death.
Aging is not a disease, but as a person passes maturity, the cells of the body and the (70) they form do not function as well as they (71) in childhood and adolescence (青春期). The body provides less (72) against diseases and is more inclined (73) accidents.A number of related causes may (74) aging. Some cells of the body have a fairly long life, but they are not (75) when they die. As a person ages, (76) of brain cells and muscle cells decreases. (77) body cells die and are replaced by new cells. In an aging person the (78) cells may not be as viable (能生存的) or as capable (79) growth as those of a young person.Another (80) in aging may be changes wi
A. use to
B. be used to
C. used to
D. had

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