单项选择题

If one wants to work more efficiently at his low point in the morning, he should ______.

A．change his energy cycle
B．overcome his laziness
C．get up earlier than usual
D．go to bed earlier
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单项选择题
After the upwarping of the plateau's surface in the Grand Canyon area, ______.
A．shallow rivers meandered in the canyon
B．the whole Colorado Plateau gradually ruse
C．three rivers came into being and cut out a long trench
D．different mountain ranges bulged upwards
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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