单项选择题

According to one theory, when the glaciers disappeared, birds ______.

A. stopped migrating
B. continued migrating
C. began migrating again
D. migrated south and stay there
<上一题 目录 下一题>
热门 试题

单项选择题
The author states that birds left the tropics because ______.
A. there was not enough food there in the winter
B. there were too many birds
C. there were too many glaciers
D. there was too much daylight
单项选择题
The life of the phoenix is described ()

A. with the use of facts
B. in a humorous way
C. in an unclear way
D. step-by-step
相关试题