问题
选择题
. She is in a poor ____ of health, which worries her mother a lot.
A．position
B．situation
C．state
D．Condition
答案
答案：C
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. She is in a poor ____ of health, which worries her mother a lot.
A．position
B．situation
C．state
D．Condition
答案：C
②乙烯的结构简式：CH2CH2
2－H＋ ④丙烷分子的球棍模型：
⑥甲烷的结构式