Two thousand years ago,a rich and powerful country cut down its trees to build warships with which to gain itself an empire.It gained the empire but,without its trees,its soil became bare and poor.When the empire fell to pieces,the country found itself faced by floods and starvation. Even where a government realizes the importance of aplentiful supply of trees,it is difficult sometimes to make the people realize this.They cut down the trees but are too careless to plant and look after new trees.So.unless the government has a good system of control,or can educate the people,the forests slowly disappear. This does not only mean that there will be fewer trees.The results are even more serious for where there are trees,their roots break the soil up,allowing the rain to sink in,and also bind the soil.This prevents the soil from being washed away.But where there are no trees,the rain fall on hard ground an flows away on the surface,and this causes floods and the rain carries away the rich topsoil in which crops grow.When all the topsoil is gone,nothing remains but worthless desert. 26.Trees are useful to man mainly in three ways,the most important of which is that they m from the hot sunshine make hi ps w qu ick p and foods 27 It'sa g a nity th C man hasn't realized the im oortance of trees to him D man hasn't found out that he has lost all trees 28 Sooner or later the forests will disappear A unless a country has a plenty sunply oftrees B unless people ston cutting down their trees C.unless all people are taught the importance of planting trees D.unless the government punishes those who cut trees instead of planting them 29.The word"bind"in Paragraph 5 means" A.to wash away B.to make we C.to make stay together D.to improve 30.When there is a heavy rain,trees can help to prevent floods,as they can A.keep rain from falling down to soft ground B.make it possible for the soll to a llow rainwater to sink in C.prevent thes fr om t ng ashed away D.ma ke the topsoil stick togethe Passage Thre Que ns 31 to35 are based on the following passage. If you are like most people,your intelligence varies from season to season.Your are probably a lot sharper in the spring than you are at any other time of year.A noted scientist.Ellsworth Huntington,concluded from other men's work and his own among peoples in different climates and temperature have a definite effect on our mental abilities He found that weather is much more favorable fo for creative thinking than is summer heaTwo thousand years ago, a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It gained the empire but, without its trees, its soil became bare and poor. When the empire fell to pieces, the country found itself faced by floods and starvation. Even where a government realizes the importance of a plentiful supply of trees, it is difficult sometimes to make the people realize this. They cut down the trees but are too careless to plant and look after new trees. So, unless the government has a good system of control, or can educate the people, the forests slowly disappear. This does not only mean that there will be fewer trees. The results are even more serious: for where there are trees, their roots break the soil up, allowing the rain to sink in, and also bind the soil. This prevents the soil from being washed away. But where there are no trees, the rain falls on hard ground and flows away on the surface, and this causes floods and the rain carries away the rich topsoil in which crops grow. When all the topsoil is gone, nothing remains but worthless desert. 26. Trees are useful to man mainly in three ways, the most important of which is that they can ____________. A. keep him from the hot sunshine B. enable him to build warships C. make him draw quick profit from them D. protect him from droughts and floods 27. It’s a great pity that ____________. A. man is only interested in building empires B. man is not eager to make profits from trees C. man hasn’t realized the importance of trees to him D. man hasn’t found out that he has lost all trees 28. Sooner or later the forests will disappear_________________________. A. unless a country has a plenty supply of trees B. unless people stop cutting down their trees C. unless all people are taught the importance of planting trees D. unless the government punishes those who cut trees instead of planting them 29. The word “bind” in Paragraph 5 means “_______________”. A. to wash away B. to make wet C. to make stay together D. to improve 30. When there is a heavy rain, trees can help to prevent floods, as they can _____________. A. keep rain from falling down to soft ground B. make it possible for the soil to allow rainwater to sink in C. prevent the soil from being washed away D. make the topsoil stick together Passage Three Questions 31 to 35 are based on the following passage. If you are like most people, your intelligence varies from season to season. Your are probably a lot sharper in the spring than you are at any other time of year. A noted scientist, Ellsworth Huntington, concluded from other men’s work and his own among peoples in different climates and temperature have a definite effect on our mental abilities. He found that cool weather is much more favorable for creative thinking than is summer heat