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问题 单项选择题 A1/A2型题

关于代谢物酶促动态法测定的叙述哪个是正确的（）

A.一般不需设置样品空白

B.测定线性>Km

C.产物的堆积对反应的影响较大

D.不需设防止底物耗竭（suBstratEDElEtion）的参数

E.孵育温度波动，测定结果不受影响

答案

参考答案：A

单项选择题

口腔护理时用于治疗铜绿假单胞菌感染的常用漱口溶液是

A．1%过氧化氢溶液

B．2%硼酸溶液

C．4%碳酸氢钠溶液

D．0.02%呋喃西林溶液

E．0.1%醋酸溶液
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单项选择题

The idea that some groups of people may be more intelligent than others is one of those hypotheses that dare not speak its name. But Gregory Cochran is (1) to say it anyway. He is that (2) bird, a scientist who works independently (3) any institution. He helped popularize the idea that some diseases not (4) thought to have a bacterial cause were actually infections, which aroused much controversy when it was first suggested.

(5) he, however, might tremble at the (6) of what he is about to do. Together with another two scientists, he is publishing a paper which not only (7) that one group of humanity is more intelligent than the others, but explains the process that has brought this about. The group in (8) are a particular people originated from central Europe. The process is natural selection.

This group generally do well in IQ test, (9) 12-15 points above the (10) value of 100, and have contributed (11) to the intellectual and cultural life of the West, as the (12) of their elites, including several world-renowned scientists, (13) . They also suffer more often than most people from a number of nasty genetic diseases, such as breast cancer. These facts, (14) , have previously been thought unrelated. The former has been (15) to social effects, such as a p tradition of (16) education. The latter was seen as a (an) (17) of genetic isolation. Dr. Cochran suggests that the intelligence and diseases are intimately (18) . His argument is that the unusual history of these people has (19) them to unique evolutionary pressures that have resulted in this (20) state of affairs.

19（）

A.limited

B.subjected

C.converted

D.directed
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