Natural disasters occur at ________ times, so it is always difficult to warn people in advance.
A．randomB．exactC．flexibleD．a(chǎn)bsolute
A
考查形容詞辨析。Random 隨機的，任意的 exact確切的 flexible靈活的，可伸縮的 absolute絕對的
句意為自然災(zāi)難可以在任何時候發(fā)生，因此提前警告人們是很困難的。
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