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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Policemen, firemen and emergency doctors all can be called first responders.
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The phrase immune to (Line 3, Para. 1) are used to mean ______.
A．unaffected by
B．hurt by
C．unlikely to be seen by
D．unknown by
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