______children get older, Doherty said, their brains may develop the ability to indentify visual  context.
A．AsB．WhenC．While D．Since
A

試題分析：As隨著；When當(dāng)……時候；While當(dāng)……時候；Since既然。句意：隨著年齡的增長，大腦會形成辨認(rèn)視覺環(huán)境的能 力。根據(jù)句意故選A.
點評：本題難度適中。判斷從句中用哪個連詞，需用記住連詞的用法，在句中的作用，連詞也是高考的熱點，需要考生平時多練習(xí)。需要考生會分析句子成分理解句意。
即學(xué)即練：______you can't answer the question, perhaps we'd better ask someone else.
A. As           B. When            C. While          D. Since
解析：D。句意：既然你無法回答這個問題，我們最好再問問別人。
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