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【单选题】
以下关于碳碳双键的描述中，哪一个是不正确的？A.
碳碳双键是由一个 σ 键和一个 π 键组成的。
B.
碳碳双键不能自由旋转。
C.
碳碳双键中的 π 键表现出较大的化学活性。
D.
乙烯分子中碳碳双键的键能是乙烷分子中碳碳单键键能的两倍。
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反馈参考答案：
举一反三
【简答题】如何在EXCEL中实现分类汇总操作?
【单选题】How did the man feel after his first marathon?
A.
He was proud of his performance.
B.
He was disappointed in himself.
C.
He knew marathons would be part of his life.
D.
He believed he would never do it again.
【单选题】How did the man feel about the police officer's final decision?
A.
Happy.
B.
Sad.
C.
Angry.
【单选题】Question: How did the man feel about the interview?
A.
He is sick.
B.
He is worried.
C.
He is confident.
D.
He is angry.
【单选题】How did the man feel about the woman's apology?
A.
Amusing.
B.
Annoying.
C.
Desirable.
D.
Reasonable.
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