有机物的结构特点之一就是多数有机物都以（ ）结合。2
A. 配价键
B. 共价键
C. 离子键
D. 氢键
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有机物中碳原子和其他原子结合时总是显示（ ）价
A. 3
B. 4
C. 5
D. 2
由于原子轨道重叠方式的不同，共价键可分为（ ）
A. s键和∏键
B. 饱和键和不饱和键
C. 极性键和非极性键
D. 双键和叁键
sp2杂化是指（ ）
A. 1个s轨道和1个p轨道
B. 1个s轨道和3个p轨道
C. 1个s轨道和2个p轨道
D. 1个s轨道和4个p轨道
Which indirect speech is wrong?
A. "I like apples," Tom said.Tom said he liked apples.
B. "I don't like action films," Lingling said.Lingling said that she didn't like action films.
C. He said, "I am here."He said that he was here.
D. My mother told me, “You should finish your homework first, then you can play with your friends.”My mother told me that I should finish my homework first and then I could go out and play with my friends.
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