单项选择题

What has sometimes caused plants to die out of the past

A．Interference from foresters.
B．Variations in climate.
C．The absence of wooded land.
D．The introduction of new type of plants.
<上一题 目录 下一题>
热门 试题

单项选择题
The lion represents those who are ______.
A．too trusting
B．strong and careful
C．reliant on force
D．lacking in intelligence
单项选择题
The writer would approve an unsuccessful political candidate ______.
A．gave up all his opportunities
B．promised to try again next time
C．overthrew the government by force
D．told the people the truth about his opponent
相关试题