单项选择题

A．forms
B．follows
C．approaches
D．introduces
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单项选择题
A．demonstratedB．composedC．hosted.D．formed
A．demonstrated
B．composed
C．hosted.
D．formed
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.
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