细胞分化是当今生物学研究的热点之一。下列关于细胞分化的叙述,正确的是() A.细

题型:选择题

问题:

细胞分化是当今生物学研究的热点之一。下列关于细胞分化的叙述,正确的是(  )

A.细胞分化导致细胞内的遗传物质发生变化

B.形成不同组织的原因是细胞分裂和分化

C.分化的细胞不再进行细胞的分裂和生长

D.细胞分化是指细胞在形态、结构和功能上的定向改变

考点:细胞的生长和分裂细胞的分化动物的组织
题型:选择题

下列选项最接近西方的“辩证法”的最终目的是?()

A、将事物有机整合

B、将事物分解为体系

C、区分事物的性质

D、综合事物的性质

题型:选择题

奇脉常见于_______的患者。

题型:选择题

阅读理解。

     How often one hears children wishing they were grown-ups and, old people wishing they were young

again. Each age has its pleasures and its pains, and the happiest person is the one who enjoys what each age

gives him without wasting his time in useless regrets.

     Childhood is a time when there are few responsibilities to make life difficult. If a child has good parents,

he is fed, looked after and loved, whatever he may do. It is impossible that he will ever again in his life be

given so much without having to do anything in return. What's more, life is always giving new things to the

child-things that have lost their interest for older people because they are too well known. But a child has his

pains: he is not so free to do what he wishes to do; he is repeatedly being told not to do something, or being

punished for what he has wrongly done.

     When a young man starts to earn his own living, he can no longer expect others to pay for his food, his

clothes, and his room, but has to work if he wants to live comfortably. If he spends most of his time playing

about in the way that he used to as a child, he will go hungry. And if he breaks the laws of society as he used

to break the laws of his parents, he may go to prison. If, however, he works hard, keeps out of trouble and

has good health, he can have the great happiness of building up for himself his own position in society.

1. According to Paragraph 2, the writer thinks that _____. [ ]

A. life for a child is fairly easy

B. a child is always loved whatever he does

C. if much is given to a child, he must do something in return

D. only children are interested in life

2. The main idea of the passage is that _____. [ ]

A. life is not enjoyable since each age has some pains

B. young men can have the greatest happiness if they work hard

C. childhood is the most enjoyable time in one's life

D. one is the happiest if he can make good use of each age in his life

3. The paragraph following this passage will most probably discuss _____. [ ]

A. examples of successful young men

B. how to build up one's position in society

C. joys and pains of old people

D. what to do when one has problems in life

题型:选择题

男性,42岁,双髋关节疼痛2年,加重3个月,并出现跛行,有服用激素和外伤史。

诊断确立后,如髋臼和股骨头软骨面完整,这时下列治疗方法中哪项应首选()

A.高压氧治疗

B.活血化瘀药物

C.全髋置换术

D.带旋髂深血管骸骨移植

E.股骨头钻孔减压

题型:选择题

白喉患者的特异性治疗,应选择()

A.适量输血

B.大量输液

C.足量抗生素

D.适量类毒素

E.早期足量抗毒素

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