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
It can be concluded from the passage that ______.
A．the Grand Canyon was formed by the internal pressure of the earth and the corrosive force of the river
B．the Grand Canyon was formed by different natural forces
C．the Grand Canyon was formed by the Hulapai River and the Colorado River
D．the Grand Canyon was formed by the corrosive force of the river and other factors
单项选择题
Which of the following statements may lead to family quarrels according to the passage
A．Unawareness of energy cycles.
B．Familiar monologues.
C．A change in a family member' s energy cycle.
D．Attempts to control the energy cycle of other family members.
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