Question

缺词填空

Trees are u 1. to men in three important ways. They p 2. them with wood and other things. They give people shade in hot days ,and they help to prevent drought(干旱) and floods（洪水）.

S 3. , in many places of the world, men don’t know the third of these is the most important. They just want to make money from the trees. Some people cut down a large n 4. of trees in the forests. Usually they are too busy c 5. down trees to plant and look after new trees so the forests slowly b 6. smaller and smaller.

This does not only m 7. that men will have fewer trees. The r 8. are even more serious. For where there are trees, their roots can prevent the rain from w 9. away the soil, but if there are no trees, the rain falls on hard ground and wash away the rich top-soil (地表土). When the top-soil is gone, n 10. remains but death.

Answer 1