单项选择题

Scientists are interested in Mars because_______________.

A．people might have to migrate there someday
B．people could live there naturally
C．life has ever existed there
D．its atmosphere is quite different
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单项选择题
Alan Johnson decided to leave New York because it is__________.
A．dirty
B．crowded
C．indifferent
D．unpleasant
单项选择题
Alan Johnson advises New Yorkers to____________.
A．bravely face the ugly aspect of the city
B．take everything as unavoidable
C．say good-bye to the city
D．be friendly with each other
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