下列化合物不能与HCN加成的是 ()
A. 正壬醛
B. 丁酮
C. 苯乙酮
D. 环己酮
Although more and more people begin to do shopping online, a majority of Internet users still do have security worries.
A. 对
B. 错
近代史上中国人民第一次大规模反侵略斗争是( )。
A. 三元里抗英
B. 武昌首义
C. 金田起义
D. 南昌起义
To compete with online shopping, many companies and shops have more special offers and begin the sales earlier than before.
A. 对
B. 错