单项选择题

案例分析题 According to the passage, the two students failed in their study because of their （）.

A．shyness
B．pride
C．self-doubt
D．laziness

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单项选择题

If we take two unrelated people at random from the population (Para. 2) means if we （）.

A．choose two persons with different intelligence
B．choose two persons who are relative
C．take out two persons of close relationship
D．pick any two persons

单项选择题

Paragraph Two implies that in treating infertility, （）.

A．the percentage of successful treatments is very high when present methods are used
B．the present treatment is very cheap
C．the cloning technology costs less time and money in treating infertility
D．the cloning technology is more suitable for treating infertility than leukemia