What is the most important service of trees to man according to the passage?
A. They help him make money.
B. They give him wood and other products.
C. They help him prevent droughts and floods.
D. They give him shade.
A. They help him make money.
B. They give him wood and other products.
C. They help him prevent droughts and floods.
D. They give him shade.
【答案】
发表评论 取消回复