题目内容
II. 完形填空(共20小题;每小题1分,满分20分)阅读下面短文,掌握其大意,然后从 21—40题各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。
Throughout history man has had to accept the fact that all living things must die. But people now live longer than they 21 . Yet, all living things still show the 22 of aging, which will eventually 23 death.
Aging is not a disease, but as a person passes maturity (成熟期), the cells of the body and the 24 they form do not function as well as they 25 in childhood and teenage years. The body provides less 26 against disease and is more 27 to have accident.
A number of related causes may 28 aging. Some cells of the body have a fairly long life, but they are not 29 when they die. As a person ages, 30 of brain cells and muscle cells decreases. 31 body cells die and are replaced by new cells. In an aging person the 32 cells may not be as workable or as capable 33 growth as those of a young person.
Another 34 in aging may be changes within the cells 35 . Some of the protein chemicals in cells are known 36 with age and become less elastic (有弹性的). This is why the skin of old people wrinkles (皱纹) and 37 . This is also the reason why old people 38 in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as DNA and RNA, store and 39 information that the cells need. Aging may affect this 40 and change the information-carrying molecules so that they do not transmit the information as well.
21. A.would B.be used to C.used to D. used
22. A.function B.effect C.affect D. appearance
23. A.lead in B.give in C.run into D. result in
24. A.hands B.feet C.heart D. organs
25. A.do B.has done C.did D. had done
26. A.energy B.protection C.vigor D. power
27. A.likely B.probable C.possible D. alike
28. A.attend to B.contribute to C.add to D. devote to
29. A.replaced B.reborn C.recovered D. surrendered
30. A.a number B.the amount C.the number D. a great deal
31. A.The others B.The other C.Another D. Other
32. A.old B.left C.new D. other
33. A.to B.for C.of D. in
34. A.factor B.effect C.reason D. element
35. A.for themselves B.of themselves C.themselves D. on their own
36. A.change B.to have changed C.to change D. to be changed
37. A.hangs loose B.hangs loosely C.is hanging loosely D.is hanging loose
38. A.increase B.shrink C.lengthen D. decrease
39. A.pass away B.pass by C.pass off D. pass on
40. A.improvement B.procession C.approach D. process
21-40 CBDDC BABAC DCCAC CABDD
解析