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
单项选择题
New York City subway system ranks first in the world in terms of the number of stations.
A．Y
B．N
C．NG
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