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
The USA is composed of 50 states, () are separated from the others by land or water.

A. two of these
B. of whom two
C. two of which
D. two of that
单项选择题
Linda has lost her wallet again. It is the second time this ().

A. has happened
B. happened
C. happen
D. was happened
相关试题