题目:
Although Jack has made good preparations for the match, he is still about his chance of winning.
A.stubborn
B.dynamic
C.sceptical
D.straightforward
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:图甲由于是对称的结构,所以核磁共振氢谱中含有的吸收峰1种;而图乙中有与E相连的2个C、与之相邻的2个C、与之相间的2个C三种氢原子,所以其的核磁共振氢谱中含有的吸收峰3种。故选项为C。