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.
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单项选择题
A．A mailman.B．A salesman.C．A house painter.D．A tax inspector.
A．A mailman.
B．A salesman.
C．A house painter.
D．A tax inspector.
单项选择题
A．5.B．3.C．4.D．2
A．5.
B．3.
C．4.
D．2
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