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Avatar (《阿凡达》) is such __________ wonderful science movie that I want to see it __________ second time.
A.a; aB.a; theC./; theD./; a

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It wasn’t long __________ the rain stopped and the sun came out again.
A.untilB.beforeC.whenD.since

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---Cathy, are you going to buy a flat in Shanghai?
---You must be joking. I can’t __________ one there.
A.spendB.payC.affordD.cost

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I can __________ be a doctor. I don’t have enough patience at all.
A.seldomB.everC.alwaysD.never

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--- __________ came to see you yesterday.
---Who was __________?
A.Somebody; heB.Anybody; he
C.Somebody; itD.Anybody; it

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---Have you ever been to Shanghai, Mary?
---Yes. I __________ there for a week with my parents last month.
A.have beenB.have goneC.wentD.was

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While she was trying to pass a truck before her, she __________ another car coming.
A.sawB.was seeingC.has seenD.sees

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甲基丙烯酸酯是世界上年产量超过100万吨的高分子单体.旧法合成的反应是:
(CH32C=O+HCN→(CH32C(OH)CN
(CH32C(OH)CN+CH3OH+H2SO4→CH2=C(CH3)COOCH3+NH4HSO4
90年代新法的反应是:
CH3CH=CH2+CO+CH3OHCH2= C(CH3)COOCH3与旧法比较,新法的优点是
A.原料无爆炸危险B.原料都是无毒物质
C.没有副产物,原料利用率高D.对设备腐蚀性较小

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---My uncle goes to climb Mount Tai every year.
---Oh, really? He __________ climbing mountains.
A.used to hateB.is used to hating
C.used to hatingD.is used to hate

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---I don’t care what my parents think.
---Well, you __________.
A.couldB.shouldC.wouldD.must

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