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【单选题】
由 CH 3 CH 2 CH 2 Br 制备 CH 3 CHBrCH 3 应采取的方法是A.
① H 2 O, H + ② HBr
B.
① H 2 O, H + ② HBr, 过氧化物
C.
① KOH, 醇 ② HBr, 过氧化物
D.
① KOH, 醇 ② HBr
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B.
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C.
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D.
though
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A.
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B.
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C.
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【简答题】听下面一段对话，回答1-4。 1. How do we pay the teachers? A. We pay them through taxes. B. We pay them directly. C. Some large factories pay them. 2 What is most of the public money used for? A. Protecting people...
【单选题】捷进2 Unit 4 P.65 Task3-1 What act of bad sportsmanship did Paolo Di Canio do in the past?
A.
He caught the ball to prenent the goalkeeper
B.
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A.
instead
B.
really
C.
however
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