下列化合物分子中的所有原子都处于同一平面的是 [ ]
①溴苯 ②对二甲苯 ③氯乙烯 ④丙烯
A.①③
B.②④
C.②③
D.①④
答案:A
根据句意及首字母(汉语)提示,补全单词。
1. People are i____new sports or games all the time.
2. If you can't stand the h____ , get out of the kitchen.
3. I would like to buy a pair of shoes with___ _(可调整的)sizes for my daughter.
4. This is a new model machine which is very easy to o .
5. We learned in school that (个人的)computers were invented in 1976.
太平天国之所以是中国农民战争的高峰,最主要的依据是()。
A、其规模和延续时间均属空前
B、建立了与清政府对立的 * *
C、制定了比较完整的革命纲领
D、对封建王朝的打击空前沉重