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【单选题】
下面四个化合物的活性最大的是 ( ) 。(只考虑电子效应)A.
CH2=CH2
B.
(CH3)2C=CH2
C.
(CH3)2C=C(CH3)2
D.
CH3CH=CH2
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【单选题】Speaker A: Uh, I wonder if I could possibly use your phone. Speaker B: ______
A.
Oh, I'm sorry, but it isn't working it's out of order.
B.
You are welcome. It's over there.
C.
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D.
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