单项选择题

A．Shop assistant and customer.
B．Post clerk and customer.
C．Store keeper and customer.
D．Waitress and customer.
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单项选择题
According to the passage, what we can do about the likelihood of extraterrestrial life is to ______.
A．find a good way of reaching a conclusion
B．construct a good theory of the origin of life
C．replace statistics with empirical knowledge
D．find whether the conditions for life are right
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