单项选择题

A．unless
B．until
C．when
D．after
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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
单项选择题
Whether there is sufficient nitrogen on Mars is important because it_________.
A．can raise the temperature of Mars
B．can protect living beings from harmful rays
C．can change the atmosphere of Mars
D．is an important part of the air people breathe
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