首页
登录
职称英语
Throughout history man has had to accept the fact that all living things mus
Throughout history man has had to accept the fact that all living things mus
游客
2024-02-26
57
管理
问题
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【C1】______things still show the effect of aging, which will eventually【C2】______death. The body and the【C3】______, they do not function as well as they【C4】______in childhood and adolescence(青春期). The body provides less【C5】______against disease and is more prone(易于……的)【C6】______accident.
A number of related causes may【C7】______to aging. Some cells of the body have a【C8】______long life, but they are not【C9】______when they die. As a person ages,【C10】______of brain cells and muscle cells decreases. Other body cells did and are replaced by new cells. In an aging person the【C11】______cells may not be as viable(能生存的)or as capable【C12】______growth as those of a young person.
Another factor in aging may be changes within the cells【C13】______Some of the protein chemicals in cells【C14】______known to change【C15】______age and become less elastic. This is why the skin of old people wrinkles and hangs loose. This is also the reason old people shrink in【C19】______. There may be other more important chemical changes in the cells. Some complex cell chemicals.【C17】______DNA and RNA, store and【C18】______information that the cells need. Aging may【C19】______this process and change the information carrying molecules【C20】______they do not transmit the information as well. [br] 【C14】
选项
A、is
B、are
C、was
D、were
答案
B
解析
主语some of the protein chemicals为复数;而且,从后中句become中得到提示,用一般现在时,描述一种客观规律。
转载请注明原文地址:https://tihaiku.com/zcyy/3483118.html
相关试题推荐
Everyanimalisalivingradiator-heatformedinitscellsisgiven
Everyanimalisalivingradiator-heatformedinitscellsisgiven
Everyanimalisalivingradiator-heatformedinitscellsisgiven
Everyanimalisalivingradiator-heatformedinitscellsisgiven
Peoplecanbeaddictedtodifferentthings--e,g.,alcohol,drugs,certain
Peoplecanbeaddictedtodifferentthings--e,g.,alcohol,drugs,certain
Peoplecanbeaddictedtodifferentthings--e,g.,alcohol,drugs,certain
Historianstendtotellthesamejokewhentheyaredescribinghistoryeduca
Historianstendtotellthesamejokewhentheyaredescribinghistoryeduca
Historianstendtotellthesamejokewhentheyaredescribinghistoryeduca
随机试题
下面你将听到一段有关青少年发展的讲话。[originaltext]Today,thereare1.8billionyoungpeo
ThereisprogresstowardapossibletreatmentforlungdiseasessuchasSARS
三相负序电压中,A相超前B相()度A.0 B.180 C.120
患者男性,72岁。9年前开始经常出现咳嗽、咳痰,近1年来症状加重,咳嗽、咳痰喘息
超低出生体重儿(ELBW)是指A.出生体重不足2000g的新生儿 B.出生体重
标准正态分布的均值和标准差分别为()A.0,1 B.1,0 C.0,0
A.脑栓塞 B.脑血栓形成 C.脑出血 D.TIA E.蛛网膜下腔出血患
_________是社会现象,是人类特有的交流工具,是交流的双方共同使用的;__
埃博拉病毒仅存在于长臂猿的体内,这种病毒对长臂猿无害但对人类却是无药可医。虽然长
《突发公共卫生事件应急条例》正式实施的时间是A.2002年5月1日 B.200
最新回复
(
0
)