题目内容（请给出正确答案）

[单选题]

Cells in the basic ranking list are divided into categories. How many categories are t

A.2

B.3

C.8

D.10

E.11

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更多“Cells in the basic ranking lis…”相关的问题

第1题

根据以下内容回答题：Scientists know that there are two basic approaches to prolonging life（

根据以下内容回答题：

Scientists know that there are two basic approaches to prolonging life（延长寿命），one approache is the elimination of the diseases that generally affect older people—diseases such as cancer，heart attack and stroke．（1）is the delay of the process of growing-old the（2）of the body． In recent years scientific researchers（3）much time in the study of the process of aging．They believe that，within a few years，they will develop the knowledge and the（4）to delay the aging process for lo to 15 years．The result will be that more people will live longer，more healthful lives．At present，scientists believe that with the right diet，exercise，medical（5），and mental attitude many people can live to he l00 years old． Gerontologists（老年学专家），people who（6）studies of the problems of growing old，are investigating（7）body cells slow down and（8）die．They feel that delaying this slowing down process（9）help postpone death．In a number of American universities，scien-tists are studying the activity of cells，the effects of diet and internal body temperature on aging．If their studies are successful，the results should help（10）the quality of life for older people in the next few years，as well as increase the life span of the next generation．

A.Others

B.Another

C.The other

D.One more

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第2题

Senility refers to great losses of intellectual capacity that occurs in old age and is ass

ociated with the widespread loss of nerve cells and the shrinkage of brain tissue. Senility is a great decline from a previous intellectual (31) in an aging person. Memory is the mental capacity most often affected. The memory loss may first show itself clearly in simple absentmindedness or a tendency to forget or (32) things and repeat oneself in conversation. As the senility progresses, the loss of memory (33) in scope until the patient can no longer remember basic social and (34) skills or function independently. There may also be declines in the person's language skills, spatial or temporal orientation, (35) or other cognitive capacities and personality changes may also be (36) to see. Senility usually has a slow, gradual onset and is most common in persons over age 75. The most common cause of the syndrome is Alzheimer's disease, which (37) for about 50 percent of all elderly persons with unbalanced mind and is hard to restore a former state. The second most common cause is vascular senility which arises from hypertension (high blood pressure) or some other vascular condition. In this type, a series of small strokes progressively destroy small (38) of the brain, eventually leading to senility. There is no (39) for Alzheimer's disease, but vascular senility can sometimes be prevented or its (40) slowed by treatment of the underlying systemic vascular disorder. Among other significant causes of senility in the elderly are Huntington's chorea, Parkinson's disease, and multiple sclerosis.A.levelB.extentC.scopeD.criterion

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第3题

Living things are ______ cells, and cells do not grow to more than twice the size they wer

e at first.

A．made from

B．made up of

C．made up from

D．made of

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第4题

cells（）

A.移动

B.细胞

C.忠诚的

D.幸运的

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第5题

The cells （电池) were designed to______sunshine to electricity to run a motor.A．convertB．a

The cells (电池) were designed to______sunshine to electricity to run a motor.

A．convert

B．alter

C．modify

D．exchange

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第6题

卡方检验过程中不包含哪个选项：（)

A.WeighCases

B.descriptive

C.crosstabs

D.Cells

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第7题

The membranes of human cells can not be disrupted because ......

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第8题

Throughout history man has had to accept the fact that all living things must die, but peo

ple now live longer than they【36】. Yet, all living things still show the【37】of aging, which will eventually.【38】death.

Aging is not a disease, but as a person passes maturity, the cells of the body and the【39】they form. do not function as well as they【40】in childhood and adolescence (青春期). The body provides less【41】against disease and is more prone【42】accident.

A number of related cause may【43】aging. Some cells of the body have a fairly long life, but they are not【44】when they die. As a person ages,【45】of brain cells and muscle cells decrease,【46】body cells die and are replaced by new cells. In an aging person the【47】cells may not be as viable (能生存的) or as capable【48】growth as those of a young person.

Another【49】in aging may be changes within the cells【50】. Some of the protein chemicals in cells are known【51】with age and become less elastic. This is why the skin of old people wrinkles and【52】. This is also the reason old people【53】in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as RNA, store and【54】information that the cell need. Aging may affect this【55】and change the information carrying molecules so that they do not transmit the information as well.

(66)

A．use to

B．be used to

C．used to

D．had

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第9题

Living things are__________ cells，and cells do not grow to more than twice the size they w

ere at first．

A.made from

B.made up

C.made up from