Throughout history man has had to accept the fact that all living things mus

游客2025-04-07 48

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, 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. This is why the skin of old people wrinkles 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. [br] 【C9】

选项 A、replaced
B、reborn
C、recovered
D、surrendered

答案 A

解析上下文语义。根据后文中“body cells die and are replaced by new cells”可知，此处作者说的是另外一种情况，即那些死亡之后不会被替代的细胞。故答案为A。

转载请注明原文地址:http://tihaiku.com/zcyy/4030714.html

相关试题推荐

随机试题

最新回复(0)

Throughout history man has had to accept the fact that all living things mus

ThemostthoroughlystudiedintellectualsinthehistoryoftheNewWorldar

ThemostthoroughlystudiedintellectualsinthehistoryoftheNewWorldar