单项选择题

What does the forest strike mankind as permanent

A．The trees are in community.
B．The forest is renewed each season.
C．Man's life is short in comparison.
D．It is an essential part our lives.
<上一题 目录 下一题>
热门 试题

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.
单项选择题
What conditions are needed for shrubs to become established
A．Ferns must take root.
B．The ground must be covered with grass.
C．More soil must accumulate.
D．Smaller plants must die out.
相关试题