天然气中，（）占绝大部分。
A.甲烷
B.乙烷
C.丙烷
D.丁烷
参考答案：A
The city is very beautiful. There are many trees on ______ sides of streets. [ ]
A. each
B. all
C. both
D. neither
酸水解的原理是什么？其水解主要受到什么的影响？
