单项选择题

Land is becoming desert little by little because ______.

A．plants can't grow there
B．there is not enough rain
C．people haven't done what scientists wish them to do
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单项选择题
The stranger had to walk to the next village because there was no bus going there.
A．Right.
B．Wrong.
C．Doesn't say.
单项选择题
The behavior of the old man is quite unusual (不寻常的).
A．Right.
B．Wrong.
C．Doesn't say.
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