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问题 单项选择题 B型题

体现不伤害原则的是（）。

A.杜绝对病人的有意伤害

B.选择受益最大、损伤最小的治疗方案

C.患者及家属无法实行知情同意时，医生可以行使家长权

D.对病人一视同仁

E.合理筛选肾脏移植受术者

答案

参考答案：A

单项选择题

关于IgA下述哪项是正确的

A．二聚体IgA结合抗原的亲和力，高于单体h
B．IgAl主要存在于血清中
C．SIgA是膜局部免疫的最重要因素
D．SIgA具有免疫排除功能
E．以上均正确
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单项选择题

It is difficult to imagine what life would be like without memory. The meanings of thousands of everyday perceptions, the bases (51) the decisions we make, an d the roots of our habits and skills are to be (52) in our past experiences, which are brought into the present (53) memory.

Memory can be defined as the capacity to keep (54) available for later use. It includes not only "remembering" things like arithmetic or historical facts, but also any change in the way an animal typically behaves. Memory is (55) when a rat gives up eating grain because he has sniffed something suspicious in the grain pile. Memory is also involved when a six-year-old child learns to swing a baseball bat.

Memory (56) not only in humans and animals but also in some physical objects and machines. Computers, for example, contain devices for storing data for later use. It is interesting to compare the memory-storage capacity of a computer (57) that of a human being. The instant-access memory of a large computer may hold up to 100000 "words" —ready for (58) use. An average American teenager probably recognizes the meanings of about 100000 words of English. However, this is but a fraction of the total (59) of information which the teenager has stored. Consider, for example, the number of facts and places that the teenager can recognize on sight. The use of words is the basis of the advanced problem-solving intelligence of human beings. A large part of a person’s memory is in terms of words and (60) of words.

53（）。

A. by

B. from

C. with

D. in
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