下列有机分子中，所有的原子不可能在同一个平面的是[ ]
A．CH2=CHCl
B．
C．
D．CH3-CH=CH2
CD
在计算689×52积的近似值时，可以把689看作______，52看作______，积大约是______．
The government needs to ______ the interests of different groups of people to avoid conflicts and
see to it that people live safe and happy lives. [ ]
A. seek
B. balance
C. identify
D. combine
sts of different groups of people to avoid conflicts and