广西成人学位英语模拟试题ModelTest4.docx

1、广西成人学位英语模拟试题ModelTest4Model Test 4Part One: Reading Comprehension (40%)Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark the c

2、orresponding letter on the Answer Sheet by blackening the letter.Passage 1Questions 1 to 5 are based on the following passage:It is clear that some chemicals can damage the health of animals and humans. However, this is not the only problem that can be caused by the careless use of chemicals. Chemic

3、als can also disturb the ecological (生态的) balance of the environment. If the ecological balance is disturbed, the consequences can be extremely serious.很明显，一些化学制品会危害人类和动物的健康。然而，这并不是滥用化学制品导致的唯一问题。化学产品还会危及环境的生态平衡。如果生态平衡遭到破坏，后果将会极端严重。The history of DDT illustrates the problem. DDT, a chemical which kil

4、ls insects, at first seemed to be a perfect answer to many problems. It would control insects that caused dangerous disease, as well as insects that caused billions of dollars of damage to crops every year. Governments permitted and even encouraged the use of DDT. Farmers in many countries began to

5、spray it on their crops. The immediate results were good. Damage to crops went down, and profits went up. However, the chemical had effects which the scientists did not predict. First, it also killed insects which were the natural enemies of the harmful insects and which were therefore beneficial to

6、 farmers. Second, and perhaps worse, DDT did not kill every harmful insect. A few insects had natural resistance to the chemical. They survived and multiplied. In a few years there were large numbers of insects which were not affected by DDT, and there were fewer insects which could act as natural c

7、ontrols on these new “super-insects”. Finally, it became clear that DDT was not solving the insect problem. In fact, it was making the problem worse. It then became necessary to find a second cure for the effects of the first!“敌敌畏”的使用历史就说明了这个问题。“敌敌畏”是一种杀灭害虫的化学制剂。最初应用时，似乎很好地解决了许多问题。对带来致命疾病或每年造成农作物巨大经

8、济损失的病虫害，它都可以杀灭。政府允许甚至鼓励使用“敌敌畏”。许多国家的农民开始往庄稼里喷洒这种农药。用药后的短期效果非常好。病虫害造成的庄稼损失下降，产量上涨了。然而，“敌敌畏”还产生了科学家没有预料到的影响。首先，这种农药也同时杀灭了病虫害的天敌，也就是那些对农业有帮助的昆虫。其次，也许更糟的是，“敌敌畏”并没有杀灭所有有害的昆虫。一些昆虫对它产生了抗体后，得以存活下来并大量繁殖。几年内，“敌敌畏”不能杀灭的害虫数量增多，而能够天然对抗这些新型“超级害虫”的昆虫也所剩无几。最后一点，“敌敌畏”不能解决害虫问题，这一点相当明确。事实上，它使情况变得更糟。于是，寻找解决“敌敌畏”遗留问题的方法

9、变得相当必要。1. The purpose of the passage is C .A. To tell that DDT can not solve the insect problemB. To compare the effects of DDT with those of other curesC. To argue that the ecological balance can be damaged by chemicalsD. To show that some chemicals can damage the health of humans and animals2. Whi

10、ch of the following is NOT true? D A. Chemicals cause health problems for animals and people.B. Chemicals can disturb the ecological balance of the environment.C. At first, the chemical DDT seemed only to have benefits.D. The long-term effects of DDT were expected by scientists.3. According to the w

11、riter, one of the problems with DDT is that A .A. It also killed insects that helped farmersB. It could not kill most of the harmful insectsC. It caused a decrease in domestic animalsD. It made some farmers suffer a disease which could not be cured4. If a farmer used DDT today, in a few years B .A.

12、He would have no problems with harmful insectsB. Insects would be an even greater problem for himC. His situation would not be quite differentD. He would be in a very dangerous situation5. Which of the following is NOT mentioned in the passage? D A. Chemicals must be used carefully.B. DDT was effect

13、ive to kill most insects.C. Harmful insects began to be resistant to DDT.D. DDT controlled all harmful insects.Passage 2Questions 6 to 10 are based on the following passage:Today television is one of the most popular forms of entertainment in the home. Some people in places where television receptio

14、n is good may think that television has taken the place of radio. Television, however, is actually a kind of radio. It uses special equipment for sending and receiving the picture. The television sound system uses the same type of equipment that is used in other forms of radio.如今，电视成为家庭娱乐中最普遍的方式之一。在

15、电视信号接收情况好的地区，有人认为电视已经取代了无线电。然而，电视实际上是无线电的一种类型。它依靠特殊的设备发送并接收图像。电视的发声系统使用与其他无线电形式一样的装备。Exchanging messages with ships at sea was one of the first uses of radio. Modern radio is still used for this purpose and for communication across oceans. On land, too, radio provides a means of instant communicatio

16、n even with moving vehicles such as taxicabs or service trucks.最早的无线电使用是海上船只间的信息交换。现代无线电技术依然应用于同一目的，保持海上通讯。同样，在陆地，即便在移动的车辆上，比如说出租车或运货卡车，无线电也提供了一种即时通讯的手段。Police forces use two-way radio to get information to and from officers in squad cars and on motorcycles. Small portable sets make it possible to communicate with a central exchange while walking or riding in a city or over countryside. Observers in airpl