下列说法中不正确的是( )
A.甲烷是最简单的有机化合物
B.碳原子能形成四个共价键
C.正丁烷和异丁烷互为同分异构体
D.甲烷和氯气混合光照后,发生了加成反应
答案:D
—May I speak to Mr Wang, please?
—Sorry, he is not in. Can I take a (an) _______ for you?
A.message
B.note
C.information
D.news