填空题

The Grand Canyon is _____________________________ (最宽处达两万四千米).

【参考答案】

about twenty-four kilometers across at its widest point

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填空题

Incompatible communications is a country-wide problem in the U.S. because of the ______ which should be converted or replaced.

单项选择题

What is NOT the cause for the imminent water war

A．Lack of water resources.
B．Lack of rainfall.
C．Inefficient use of water.
D．Water has replaced oil.

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