Avatar (《阿凡达》) is such __________ wonderful science movie that I want to see it __________ second time.
| A．a; a | B．a; the | C．/; the | D．/; a |
It wasn’t long __________ the rain stopped and the sun came out again.
| A．until | B．before | C．when | D．since |
---Cathy, are you going to buy a flat in Shanghai?
---You must be joking. I can’t __________ one there.
---You must be joking. I can’t __________ one there.
| A．spend | B．pay | C．afford | D．cost |
I can __________ be a doctor. I don’t have enough patience at all.
| A．seldom | B．ever | C．always | D．never |
--- __________ came to see you yesterday.
---Who was __________?
---Who was __________?
| A．Somebody; he | B．Anybody; he |
| C．Somebody; it | D．Anybody; it |
---Have you ever been to Shanghai, Mary?
---Yes. I __________ there for a week with my parents last month.
---Yes. I __________ there for a week with my parents last month.
| A．have been | B．have gone | C．went | D．was |
While she was trying to pass a truck before her, she __________ another car coming.
| A．saw | B．was seeing | C．has seen | D．sees |
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：
（CH3）2C＝O＋HCN→（CH3）2C（OH）CN
（CH3）2C（OH）CN＋CH3OH＋H2SO4→CH2＝C（CH3）COOCH3＋NH4HSO4
90年代新法的反应是：
CH3CH＝CH2＋CO＋CH3OH
CH2＝ C（CH3）COOCH3与旧法比较，新法的优点是
（CH3）2C＝O＋HCN→（CH3）2C（OH）CN
（CH3）2C（OH）CN＋CH3OH＋H2SO4→CH2＝C（CH3）COOCH3＋NH4HSO4
90年代新法的反应是：
CH3CH＝CH2＋CO＋CH3OH
CH2＝ 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 |
---My uncle goes to climb Mount Tai every year.
---Oh, really? He __________ climbing mountains.
---Oh, really? He __________ climbing mountains.
| A．used to hate | B．is used to hating |
| C．used to hating | D．is used to hate |
---I don’t care what my parents think.
---Well, you __________.
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---Well, you __________.
| A．could | B．should | C．would | D．must |