单项选择题

What is the most important function of trees

A．Providing fuel.
B．Offering shade.
C．Preventing natural disasters.
D．Providing charcoal.
<上一题 目录 下一题>
热门 试题

单项选择题
The role of trees is to______.
A．loose soil
B．keep soil in position
C．harden soil
D．Both A and B
相关试题