汽油碱洗主要是洗去汽油中的（）等物质。
参考答案：H2S、硫醇、硫酚、环烷酸
Not only I but also Jane and Mary tired of having one examination after another.
A．is
B．are
C．am
D．be
相传最早来武当山修炼的是谁？
