【文章內(nèi)容簡介】 litical environment. For example, raising taxes will raise criticisms and protests while lowering taxes means you will have less money to play with. What about external decisions? Well, you have to deal with military issues, global economics, trade agreements, and spending time lobbying（游說） other presidents. You can determine the course of world events by invading（侵略） a neutral（中立） country, or toppling（推翻） an unfriendly country but then you must face the economic, political, and military consequence. Don’t want to be president of the US? The game also lets you bee virtual（虛擬的） leader of other countries including France, Germany, Spain and Russia. 56. The purpose of writing this passage is mainly to ______. A. show you how hard it is to be the newlyelected president, Barack Obama B. explain why the video game is so popular among American citizens C. introduce to you one special puter game, Commander in Chief D. inform how designers developed the interesting puter game 57. Which of the following items belongs to internal affairs in the game? A. Managing budgets, responding to critics and military issues. B. Managing budgets, raising taxes and trade agreements. C. Health care, discussing proposal laws and lowering taxes. D. Education, security and lobbying other countries. 58. Which of the following is TRUE according to the passage? A. Those who want to be a president one day will get a taste of their private life. B. The first task in the game is to form the Cabi consisting of 250 members. C. The video game has hit the stories in American and enjoys sales success. D. Like a real president, the player will face challenges at home and abroad. B Trees are useful to man in three very important ways: they provide him with wood and other products, they give him shade, and they help to prevent drought and floods. Unfortunately, in many parts of the world man has not realized that the third of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. 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 hard and poor. When the empire fell to pieces, the country found itself faced by floods and starvation. Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade the villager to see this. The villager wants wood to cook his food with, and he can earn money by making charcoal(木炭 ) or selling wood to the townsman（城市居民） . He is usually too lazy or too careless to plant and look after trees. So unless the government has a good system of control, or can educate the people, the forests will slowly disappear. This does not only mean that the villager’ s sons and grandsons have 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 hold the soil, thus preventing it being washed away easily, but where there are no trees, the soil bees hard and poor. The rain falls on hard ground and flows away on the surface, causing floods and carrying away with it the rich topsoil, in which crops grow so well. When all the topsoil is gone, nothing remains but a worthless desert. 59. The purpose that the writer wrote this article is to ______. A. tell people the use of wood B. tell people the function of tree roots C. warn that man mustn’t destroy forests any more D. explain how trees help to prevent drought and floods 60. In the writer’ s opinion,_____, or the forests will slowly disappear. A. measures must be taken B. people shouldn’t draw benefit from the tree C. government must realize the serious results D. unless trees never be cut down 61 According to the article we know it is _____ to prevent the forests from slowly disappearing. A. necessary but impossible B. necessary but difficult C. impossible and unimportant D. difficult and impossible 62. In the last two paragraphs the writer wanted to make it clear that _____ . A. where there are no trees, the soil bees poor but soft B. where there are many trees, there are more floods C. where there are no trees, the land might bee desert slowly