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问题 单项选择题 A1/A2型题

药物的半衰期主要取决于哪个因素（）

A.药物有吸收速度

B.消除的速度

C.药物的分布速度

D.给药的途径

E.药物的溶解度

答案

参考答案：B

解析：生物半衰期是体内药量或药物浓度下降一半所需要的时间，用t来表示，单位为时间。

单项选择题 B1型题

嵌合型Down综合征的核型是（）

A.核型46，XX（XY），-14，+t（14q21q）

B.核型46，XX（XY），-21，+t（21q21q）

C.核型45，XO

D.核型46，XX（XY），+21

E.核型46，XX（XY）／47，XX（XY），+21
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单项选择题

Since we are social beings, the quality of our lives depends in large measure on our interpersonal relationships. One strength of the human condition is our tendency to give and receive support from one another under stressful circumstances. Social support consists of the exchange of resources among people based on their interpersonal ties.

Those of us with p support systems appear better able to cope with major life changes and daily hassles (困难). People with p social ties live longer and have better health than those without such ties. Studies over a range of illnesses, from depression to heart disease, reveal that the presence of social support helps people fend off (挡开) illness, and the absence of such support makes poor health more likely.

Social support cushions stress in a number of ways. First, friends, relatives, and co-workers may let us know that they value us. Our self-respect is strengthened when we feel accepted by others despite our faults and difficulties. Second, other people often provide us with informational support. They help us to define and understand our problems and find solutions to them. Third, we typically find social companionship supportive. Engaging in leisure-time activities with others helps us to meet our social needs while at the same time distracting (转移……注意力) us from our worries and troubles. Finally, other people may give us instrumental support—financial aid, material resources, and needed services—that reduces stress by helping us resolve and cope with our problems.

Helping a sick neighbor with some repair work is an example of ().

A. instrumental support

B. informational support

C. social companionship

D. the strengthening of self-respect
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