2018上半年英语四级阅读理解考前预测题

　　Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death.

　　Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised.

　　First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent .

　　Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth.

　　1.According to the author, the deaths among youth are mainly caused by _____.

　　a.traffic accidents

　　b.smoking-related desease

　　c.murder

　　d.all of these

　　2.Every day there are over_____high school strdents who will become regular smoker.

　　a.75 b.23 c.30 d.3000

　　3.By "dropout" the author means______.

　　a.students who failed the examination

　　b.students who left school

　　c.students who lost their way

　　d.students who were driven out of school

　　4.The reason for declining adolescent smoking is that ________.

　　a.NCI has taken effective measures

　　b.smoking is prevented among high school seniors

　　c.there are many smokers who have died of cancer

　　d.none of these

　　5.What is implied but not stated by the author is that ________.

　　a.smoking rates among youth have declined very little

　　b.there are now more female than male smokers among high school seniors

　　c.high smoking rates are due to the incease in wealth

　　d.smoking at high school are from low socio-economic backgrounds

　　答案：bdbdb

　　The food we eat seems to have profound effects on our health.Although science has made enormous steps in making food more fit to eat ,it has, at the same time,made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well,especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is nto a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats,and other food additivies,caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to beef and living animals, and because of this ,penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes,but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration(FDA) has tried repeatedly to control these procedures, the practices continue.

　　1.What is the best possible title of the passage?

　　a.Drug and Food

　　b.Cancer and Health

　　c.Food and Health

　　d.Health and Drug

　　2.Which of the following statements is NOT ture?

　　a.Drugs are always given to animals for medical reasons

　　b.Some of the additives in our food are added to the food itself and some are given to the living animals

　　c.Researchers have known about the potential dangers of food additives for over thirty-five years.

　　d.Food may cause forty percent of cancer in world.

　　3.How has science done something harmful to mankind?

　　a.Because of science , diseases caused by polluted food haven been virtually eliminated.

　　b.It has caused a lack of information concerning the value of food.

　　c.Because of the application of science,some potentially harmful substances have been added to food.

　　d.The scientists have preserved the color of meats,but not of vegetables.

　　4.What are nitrates used for?

　　a.They preserve flavor in packaged foods.

　　b.They preserve the color of meats.

　　c.They are the objects of research.

　　d.They cause the animals to become fatter.

　　5.The word 'carcinogenic' most nearly means '_____'.

　　a.trouble-making

　　b.color-retaining

　　c.money-making

　　d.cancer-causing

　　答案：cacbd