单选题 The following two questions are based on the following passage:
A study by a group of dentists has concluded that regular use of a certain brand of mouthwash is as effective as flossing in preventing gum disease. The mouthwash company has released a television ad suggesting that people who do not like flossing can now rely solely on mouthwash and brushing to maintain good dental health. A leading manufacturer of dental floss brought a lawsuit against the mouthwash company demanding that the advertisement be discontinued on the grounds that it is misleading.

单选题 Which of the following, if true, provides the strongest support for the dental floss company's claim that the advertisement is misleading?
A. The dental floss manufacturer is concerned that it will lose market share in the dental health market because the advertisement encourages people to switch from dental floss to mouthwash.
B. The dental floss company claims in its own advertisements that brushing and flossing after every meal is the most effective way to maintain good dental health.
C. Although mouthwash is an effective deterrent to gum disease, it is less effective than dental floss at removing plaque and preventing cavities between teeth.
D. Per usage, mouthwash is three times more expensive than dental floss, if the recommended amounts of both products are used.
E. The dentists who conducted the study on the effectiveness of mouthwash in preventing gum disease obtained their funding for the study from a company that manufactures mouthwash.

单选题 Which of the following, if true, most supports the mouthwash company's defense that its advertisement promotes greater public health?
A. Since the dental floss company is protesting the advertisement only to protect its own economic self-interest, it cannot be seen as representing greater public health.
B. Greater public health is best served if people use both mouthwash and dental floss, a combination that has been shown to be more effective than either method used alone.
C. Many people object to flossing because it is painful and causes their gums to bleed.
D. Since, on average, people are twice as likely to use mouthwash regularly as to floss regularly, the advertisement will increase the number of people who take effective action against gum disease, a serious public health problem.
E. Gum disease has been proven to have links with the early onset of heart disease, one of the top three threats to public health in terms of mortality.

单选题 An electrical appliance company has submitted a new model of washing machine for stress and durability testing. After the conventional round of tests, 26 of the 90 machines tested no longer functioned. Observing these results, the company determined that the washing machine model was acceptable for the consumer market.
Which of the following, if true, most strongly supports the company's decision regarding the washing machine?
A. When the number one rated washing machine was submitted for stress and durability testing, 96 out of 100 machines were still functioning at the end of the test.
B. Because of the extreme stress of the testing process, any model that has more than two-thirds of its machines functioning at the end of the test process is considered sufficiently durable for the consumer market.
C. Most consumers will tolerate a washing machine that functions only 64 times out of 90 attempts.
D. Although the model tested is less durable than other models on the market, its projected price is considerably lower than that of the most durable models.
E. The electrical failure that brought down most of the 26 washing machines that ceased functioning could probably be avoided if the machine were redesigned.