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

问答题

我们居住的地球是一个大球体。