单项选择题

A．5.
B．3.
C．4.
D．2
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单项选择题
A．There is not enough oxygen.B．We are short of grain.C．Air and water are abundant.D．Forests are beautiful.
A．There is not enough oxygen.
B．We are short of grain.
C．Air and water are abundant.
D．Forests are beautiful.
单项选择题
A．It is no fun under any circumstances.B．It is free when the pay and the conditions are good.C．It is always exciting and rewarding.D．There is probably no perfect job, so one must keep looking.
A．It is no fun under any circumstances.
B．It is free when the pay and the conditions are good.
C．It is always exciting and rewarding.
D．There is probably no perfect job, so one must keep looking.
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