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．appearedB．feltC．seemedD．sounded
A．appeared
B．felt
C．seemed
D．sounded
单项选择题
A．expressingB．explainingC．exposingD．illustrating
A．expressing
B．explaining
C．exposing
D．illustrating
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