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(gè)實(shí)驗(yàn)的目的是什么？
--這個(gè)實(shí)驗(yàn)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(dòng)形式表被動(dòng)意義，所以選C．

點(diǎn)評(píng) 英語中，一些動(dòng)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(huì)事物的特性，用主動(dòng)表被動(dòng)，結(jié)構(gòu)是主語+動(dòng)詞+加副詞．

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