2010年12月大学英语四级cet4预测试卷江涛

Part Ⅰ Writing (30 minutes)
　　Directions: For this part, you are allowed 30 minutes to write a composition on the topic College Graduates Work as Village Officials. You should write at least 150 words according to the outline given below in Chinese:
　　1. 你是否认为大学生当村官是个好主意
　　2. 大学生能给乡村提供些什么来源：恒星网
　　3. 大学生能从村官职位中获得什么
　　注重：此部分试题在答题卡1上。
　　Part Ⅱ Reading Comprehension (Skimming and Scanning) (15 minutes)
　　Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1. For questions 1-7, choose the best answer from the four choices marked A), B), C) and D). For questions 8-10, complete the sentences with the information given in the passage.
　　How Infectious Diseases Work
　　The human body is both surrounded and inhabited by billions of microorganisms. Most microorganisms are harmless or even beneficial; for example, bacteria that normally live in the digestive system help digest food. Occasionally, however, a microorganism capable of causing a disease invades the body. Diseases caused by such microorganisms are called infectious diseases.
　　Infectious diseases are contagious; that is, they can be passed from one person to another. They can be transmitted by skin contact, through body fluids, in contaminated food or drink, or via airborne particles containing the microorganisms, although the pathways and ease of transmission vary by disease.
　　Animal or insect bites are another means of transmission. The two most common types of infectious diseases are bacterial infections and viral infections.
　　Disease-causing, or pathogenic, bacteria either attack the body’s tissues directly or cause damage by secreting poisonous substances called toxins. Fortunately, bacterial infections are often curable. Certain bacteria can be killed by drugs; other bacterial diseases can be prevented by vaccination.
　　Viruses are the smallest known microorganisms. They are responsible for diseases as relatively harmless as the common cold and as serious as meningitis. Viruses live and reproduce only within living cells, and only certain cells are susceptible to a specific virus. You can be host to many viruses without suffering any adverse effects, but if enough cells are attacked, you will become sick.