Thanks to scientific research, we now have a good understanding of ______ an earthquake is and why it happens.
A．howB．whichC．whetherD．what
D

試題分析：經(jīng)分析，of是介詞，后接賓語從句，而is是系動詞，后接表語，故應(yīng)選D。本句含義，多虧了科學(xué)研究，現(xiàn)在我們對什么是地震以及為什么發(fā)生地震有了很好的了解。
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