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【单选题】

In the second paragraph '...if we take two unrelated people at random from the population' means if we ______.

A.
pick any two persons
B.
take out two different persons
C.
choose two persons who are relatives
D.
choose two persons with different intelce
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参考答案:
参考解析:
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刷刷题刷刷变学霸
举一反三

【单选题】根据短文,下列对硫酸铁对海洋作用的说法,不正确的是( )。

A.
可以提高生态系统生产力
B.
可大幅度提高海域硅藻等藻类的生长
C.
海中浮游生物会增加
D.
将成为一个新的温室气体的来源

【单选题】The author uses the example of the early models of high-speed railroad cars primarily to ______.

A.
support the thesis that the number of errors in modern engineering systems is likely to increase
B.
illustrate the idea that courses in design are the most effective means for reducing the cost of designing engineering systems
C.
support the contention that a lack of attention to the nonscientific aspects of design results in poor conceptualization by engineers
D.
weaken the proposition that mathematics is a necessary part of the study of design