2. 财经
  3. Aging Throughout history man has had to accept the fact that all living things must die，but people now live longer than they use

Aging Throughout history man has had to accept the fact that all living things must die，but people now live longer than they use

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问题 Aging
Throughout history man has had to accept the fact that all living things must die，but people now live longer than they used to．Yet all living things still show the_________(1)of aging，which will eventually_________(2)death．
    Aging is not a disease，but as a person passes maturity，the cells of the body and the_________(3)do not function as well as they did in childhood and adolescence(青春期)．The body provides less_________(4)against disease and is more likely_________(5)have accident．
  A number of related causes may_________(6)aging．Some cells of the body have a fairly long life，but they are not reborn when they die．As a person ages，_________(7)of brain cells and muscle cellsdecreases．The other cells are replaced by new cells．In an aging person the_________(8)cells andmuscle cells may not be as viable(能生存的)or as capable_________(9)growth as those of a young person．
  Another_________(1 0)in aging may be changes within the cells themselves．Some of the protein chemicals in cells are known_________(1 1)with age and became less elastic.This is why the skin of old people wrinkles and_________(12)．This is also the reason old people_________(13)in height．Theremay not be other more important chemical changes in the cells．Some complex cell chemicals，such asDNA and RNA，store and_________(14)information that the cells need.Aging may affect this_________ (15)and change the information—carry molecules so that they do not transmit the information aswell．
(10)
选项 A、factor
B、effect
C、reason
D、element
答案C
解析 这一段是和上一段平行的，都是谈论导致衰老的原因，C选项与题意相符，因此，为正确答案。
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