单项选择题

In the Gobi, the most frequent changes in the weather occur ______.

A．after mid-September or the first of October
B．about the second week in April
C．in early or middle June
D．in mid-August to mid-September
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单项选择题
In this passage the author briefly describes ______.
A．the different seasonal changes
B．the effects of climatic change on msn and beasts
C．the Gobi as a terrible place to live in
D．the seasonal cycle of the Gobi
单项选择题
The word distinct in the second paragraph is closest in meaning to ______.
A．quite the same
B．extremely bad
C．clearly different
D．unclearly separate
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