单项选择题

Every field of chemistry( )different chemical reactions.

A．holds
B．consists
C．composes
D．involves
<上一题 目录 下一题>
热门 试题

单项选择题
When Bob and his friends came, we( )our supper then.
A．had
B．were having
C．have
D．are having
单项选择题
Have you ever seen a( )bag on the table
A．plastic small black
B．black small plastic
C．plastic black small
D．small black plastic
相关试题