单项选择题

A．It served as a fertilizer for crops.
B．It formed a new mountain.
C．It stabilized air temperatures.
D．It destroyed various insect pests.
<上一题 目录 下一题>
热门 试题

问答题
What makes going to space the most expensive vacation is the enormous cost involved in________.
单项选择题
To make your humor work, you should ________.
A．take advantage of different kinds of audience
B．make fun of the disorganized people
C．address different problems to different people
D．show sympathy for your listeners
相关试题