2．______ is known to us all that the old scientist，for ______ life was hard in the past，still works hard in his eighties．（　　）
A．It； whomB．As；whoseC．As；whomD．It；whose

分析 眾所周知，這位年老的科學家，過去他的生活很艱難，在他八十多歲時仍然努力工作．

解答 答案：A 考查it的用法．第一空：it is known to us all that…是個固定句型，意為"眾所周知…"．第二空：介詞+關系代詞引導的定語從句，先行詞the old scientist指人，作介詞for的賓語，只能用whom，故選A．

點評 考查it用法，弄清楚it的各種用法，準確地翻譯句子，然后根據(jù)句意，選擇最合適的答案．

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