【正文】 and Radiation. “EPA is encouraging people to test for radon — a simple step to providing peace of mind.” Radon is a radioactive gas that seeps(滲透 ) into your home from underground, and can reach harmful levels if trapped indoors. The only way to know if your home contains high radon levels is to test for it. Nearly 80 percent of American homes have not been tested for radon, even though a simple test costing as little as $25 can help detect a possible radon problem. If radon is found, homeowners should find qualified professionals to reduce radon exposure for a cost similar to many mon home improvement repairs. Because we can?t see or smell radon, it?s a real challenge for us when trying to raise awareness about its public health risk. Radon is the secondleading cause of lung cancer in the United States, but it is pletely preventable. People can protect their family with a simple first step, and then take action to prevent radon exposure by testing their homes. The EPA is launching a campaign to inform people about radon and is working with anizations across the country to educate the public on how to protect themselves from radon exposure in their homes. It is also encouraging the use of radonresistant construction materials. 64. If we find out that there is too much radon in our homes, we should ______. A. deal with it by ourselves B. turn to professionals for help C. leave it alone D. repair the house 65. It can be inferred from the passage that ________. A. it will cost people a lot of money to test for radon B. most of today?s houses can?t resist radon effectively C. everyone understands the danger of radon D. it is hard for homeowners to stay away from radon 66. By saying “Healthy homes make for healthy families”, Bill Wehrum means ______. A. a healthy home environment is good for people?s health B. a healthy home can make people live a happy life C. healthy families never suffer from radon D. healthy homes don?t need to be tested for radon 67. Which of the following is the best title for the passage? A. EPA—an Important National Organization B. How to Avoid Harmful Gases C. Radon—the Main Cause of Lung Cancer D. A Radon Test Can Help Prevent Lung Cancer D Twenty years ago only two kinds of toothbrushes were available in the market—one for adults and the other for children. Ten years ago, the children?s market was divided up. There were brushes designed for infants, brushes for kindergarten pupils, brushes for primary schoolchildren, and for secondaryschool students. Today, market segmentation has gone even further, and you can buy toothbrushes for one to threeyearolds, two to fouryearolds, three to fiveyearolds, and four to sixyearolds, not to mention separate brushes for the front teeth, the back teeth, bridges and interdental (牙齒間的 ) spaces. And yet the dentists (牙科醫(yī)生 ) are still as busy as ever, for the fact is that the use of toothbrushes has had no effect in fighting tooth problems. Dentists still say what they have always said: the important thing is for people to spend enough time cleaning their teeth. Seven minutes a day is a figure often suggested. But in the consumer society, advice from dentists is not enough. Consumers must be persuaded to buy products by advertising. The morning shampoo is another example of consumerism in personalhygiene (個(gè)人衛(wèi)生 ) industry. In spite of many warnings about the dangers of washing one?s hair too often, a daily morning shampoo has bee fashionable, particularly among young people and housewives. The shampoo industry has latched (依附 ) onto an opportunity to extend its market, not just by selling more of the usual product but also by marketing such things as speciallydesigned morningshampoo towels(towels being found to be no different than normal ones). 68. The first paragraph mainly tells us about _________. A. how to choose a suitable toothbrush B. the diversity of toothbrushes C. how the toothbrushes were designed D. the advantages of using toothbrushes 69. The underlined word “segmentation” in the first paragraph probably means “_________”. A. division B. price C. amount D. quality 70. From this passage, we can know that ________. A. morning shampoo does good to people?s hair B. most people tend to accept the dentist?s advice C. there are still as many tooth problems as before D. morning shampoo is only popular with woman 71. The shampoo industry can extend their markets by ___. A. producing some side products B. advertising their products C. developing new kinds of shampoo D. encouraging people to wash hair E People who buy things are called consumers. Consumers have choices. We usually choose the color, taste, smell or size of what we buy, but there are other choices we can make. The following questions will help you to consider these choices. If you don?t like the place it was made, you might decide not to buy that particular product. A lot of people don?t buy products from certain countries when they don?t like these countries. Was it made in a factory or on a local farm? If the product was unbelievably cheap, the people who made it might not have been paid much. Do you