大学英语四级模拟题四一 二三四五六试卷总得分核查人 Part OneReading Comprehension (2’×10 = 20’)Directions: There are 2 passages in this section. 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 corresponding letter on the Answer Sheet with a single line through the centre.Passage OneAir pollution can spread from city to city. It even spreads from one country to another. Some northern European countries have had “black snow” from pollutants that have traveled through the air from other countries and have fallen with the snow. So air pollution is really a global problem.Air pollution can kill babies, older people, and those who have respiratory （呼吸的）diseases. As found in cities, air pollution increases the risks of certain lung diseases.Air pollution can cause both airplane and car accidents because it cuts down visibility （能见度）. There are other possible health dangers from air pollution that we don’t know much about. For example, scientists are trying to find out whether chemicals that reach us from the air may cause changes in our cells. These changes might cause babies to be born with serious birth defects. Scientists are trying to learn how all the many chemicals are apt（易于的）to take into our bodies from air, water, food, and even medicines act together to affect our health and the way our bodies work. That is another reason why it is so important to begin to control pollution now instead of waiting until we learn all the answers.Air pollution costs us a lot of money. It corrodes（腐蚀）our buildings. It damages farm crops and forests. It h...
