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Avatar (《阿凡達(dá)》) is such __________ wonderful science movie that I want to see it __________ second time.
A.a(chǎn); aB.a(chǎn); 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.a(chǎn)ffordD.cost

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I can __________ be a doctor. I don’t have enough patience at all.
A.seldomB.everC.a(chǎn)lwaysD.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產(chǎn)量超過100萬噸的高分子單體.舊法合成的反應(yīng)是:
(CH32C=O+HCN→(CH32C(OH)CN
(CH32C(OH)CN+CH3OH+H2SO4→CH2=C(CH3)COOCH3+NH4HSO4
90年代新法的反應(yīng)是:
CH3CH=CH2+CO+CH3OHCH2= C(CH3)COOCH3與舊法比較,新法的優(yōu)點(diǎn)是
A.原料無爆炸危險(xiǎn)B.原料都是無毒物質(zhì)
C.沒有副產(chǎn)物,原料利用率高D.對(duì)設(shè)備腐蝕性較小

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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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