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问题 单项选择题

IgG抗体不能直接与红细胞发生凝集反应的主要原因是（）

A.IgG抗体的亲和力不够

B.IgG抗体分子太小

C.IgG抗体分子效价不够

D.IgG抗体分子数量太少

E.IgG抗体分子对经酶处理的红细胞无反应

答案

参考答案：B

判断题

《完好标准》规定盘根不过热，滴水不成线。
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单项选择题

For years we have believed we were either healthy or sick. (55) , during the mid-90s, scientists developed a new concept called "sub-health", a status (56) health and illness. The concept of sub-health has become (57) because it has helped to explain many health problems. (58) one study, only 5. 6% of people in the overall population are actually sick, (59) the subhealthy group consists of about 60%, and the (60) population is considered healthy. (61) of one’s sub-health will help one to be alert to the underlying disease and remain healthy. Sub-health is a state in which the body is (62) turning from health to illness or from illness to health. Our bodies are actively (63) the conditions of health, sub-health and disease. Factors (64) aging, internal or external toxicity (毒性), and body or mind exhaustion may cause sub-health, but taking good care of the body can change a sub-healthy status to a healthy one.

62().

A. Thanks to

B. Due to

C. According to

D. Prior to
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