单项选择题

The article is written to explain ______.

A．the forming of the Grand Canyon
B．the surface in the Grand Canyon
C．the rivers in the Grand Canyon
D．the cataclysmic appearance of the Grand Canyon
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单项选择题
If a person finds getting up early a problem, most probably ______.
A．he is a lazy person
B．he refuses to follow his own energy cycle
C．he is not sure when his energy is low
D．he is at his peak in the afternoon or evening
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