17．-What is the purpose of this experiment？
-To figure out whether this material         easily under high pressure．（　�。�
A．is brokenB．will be brokenC．breaksD．broke

分析 --這個實驗的目的是什么？
--這個實驗的目的是看看這些材料在高壓下是不是很容易碎．

解答 答案：C 
本句中的break是表示主語的屬性或者特征，要用主動形式表被動意義，所以選C．

點評 英語中，一些動詞如sell（銷售），wash（洗），clean（打掃），burn（燃燒），cook（煮），break（破碎）等，常常與副詞如well（好），easily（容易地），perfectly（十分地）等連用，描會事物的特性，用主動表被動，結構是主語+動詞+加副詞．

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