单项选择题

We find that some birds ______twice a year between hot and cold countries.

A. transfer
B. migrate
C. commute
D. mobilize
<上一题 目录 下一题>
热门 试题

单项选择题
A series of seminars ______ scheduled.
A. has
B. is
C. /
D. are
单项选择题
______ air is to man, so is water to fish.
A. Like
B. As
C. Since
D. For
相关试题