完型填空A 期末复习资料.doc

完型填空A 2Throughout history man has had to accept the fact that all living things must die, but people now live longer than they 1 . Yet, all living things still show the __2 of aging, which will eventually 3 death. Aging is not a disease, but as a person passes maturity, the cells of the body and the organs they form do not function as well as they did in childhood. The body provides less 4 against diseases and is more inclined 5 accident. A number of related causes may contribute to aging. Some cells of the body have a fairly long life, but they are not 6 when they die. In an aging person the new cells may not be as capable 7 growth as those of a young person. Another 8 in aging may be changes within the cells themselves. Some of the protein chemicals in cells are known to change with age and become less flexible. This is why the skin of old people wrinkles. This is also the reason old people 9 in height. There may be other more important chemicals changes in the cells. Some complex cell chemicals, such as DNA and RNA, store and 10 information that the cells need. Aging may affect this process and change the information-carrying molecules so that they do not transmit the information as well. (1)、 A：had B：use to C：were used to D：used to (2)、 A：fact B：effect C：function D：symbol (3)、 A：affect B：produce C：result in D：result from (4)、 A：protection B：demand C：decline D：delay (5)、 A：to B：for C：against (6)、 A：replaced B：born C：recovered D：discovered (7)、 A：with B：for C：of D：to ：C (8)、 A：factor B：effect C：reason D：element (9)、 A：short B：shrink C：lengthen D：increase (10)、 A：pass to B：pass from C：pass on D：pass on to 3、Certainly, the most popular method of traveling used by Americans is the privately-owned automobile. The vast majority of Americans have a car, and many families have two. 1 during your visit to the United States, you may decide to rent a car to travel outside the city or to travel to other parts of the country