通常用来衡量一个国家石油化工发展水平标志的是[ ]
A.甲烷的产量
B.乙烯的产量
C.乙醇的产量
D.苯的产量
答案:B
-I said hello to you in the street yesterday, but you ________ me completely.
-I'm sorry.Maybe I didn't notice you.[ ]
A.cheated
B.hid
C.ignored
D.recognized
下列关于一指禅推法的叙述中,错误的是()
A.以拇指端或螺纹面着力
B.腕关节做主动摆动
C.紧推慢移
D.掌虚指实