短文填空
请用适当的词完成下面的短文,并把所缺单词填写在答题卡指定的位置上。每个空只能填写一个形式正确、意义相符的单词。
Trees are useful to man in three very important ways. The first important way is that they provide man _______ food, wood and other products(产品). Trees provide man and animals with food to live __
__ the earth. It’s not easy ____
___ man to live on the earth without trees.
The ________ important way is that trees give us shade(树荫). On a hot summer day, people can have __
_____ rest under the shade of a tree after they have walked a long way. You can imagine(想象) _
_____ important the shade of a tree is to man and animals.
The third important _______ is that trees help to prevent droughts(干旱)and floods. However, in many parts of the world, man has ___
_____ realized the third important way. He has cut ____
____trees in large numbers. ____
_____ the end, he finds that he has lost his best friends.