单项选择题

The twins ______ American girls. They are in ______ class,

A．are; the same
B．is; the same
C．is; same
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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
单项选择题
From this passage, we learn that ______.
A．plants can keep dry land from becoming desert
B．it is good to get rid of the grass in the desert
C．all places without much rain will become desert
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