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Which of the following is NOT equivalent to $${49}({a}^{2})={9}({b}^{2})-{4}$$?
GWD In 1981 children in the United States spent an average of slightly less than two and a half hours a week doing household chores; by 1997 they had spent nearly six hours a week.
Native American burial sites dating back 5,000 years indicate that the residents of Maine at that time were part of a widespread culture of Algonquian-speaking people.
PREP07 Test 2 Although at one time children's programming had been limited to a few hours a week, now, however, there are at least four cable networks that dedicate themselves entirely to shows produced specifically for children.
PREP07 Test 2 Compared to those who do not, running three days a week saves an average of 14.1 percent on health-care costs each year in the United States.
GWD Until recently, the Inuit people led a nomadic existence, sheltering in igloos, the ice-block domes that are peculiar to north-central Canada, and in structures made of stones, bones, driftwood, and skins.
Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not.
Magoosh Which of the following would constitute evidence against Turcotte's model?
OG19 OG20 OG2022 Over the past ten years cultivated sunflowers have become a major commercial crop, second only to soybeans as a source of vegetable oil.
OG20-语文分册 In contrast with a dark surface and its tendencv toward heat absorotion, a large expanse of snow and ice reflects incoming radiation into space.
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The primary purpose of the passage is to
GWD Editorial:An arrest made by a Midville police officer is provisional until the officer has taken the suspect to the police station and the watch commander has officially approved the arrest. Such approval is denied if the commander judges that the evidence on which the provisional arrest is based is insufficient. A government efficiency expert has found that almost all provisional arrests meet standards for adequacy of evidence that watch commanders enforce. The expert therefore recommends that the watch commander's approval should no longer be required since the officers' time spent obtaining approval is largely wasted. This recommendation should be rejected as dangerous, however, since there is no assurance that the watch commanders' standards will continue to be observed once approval is no longer required.In the editorial, the two portions in boldface play which of the following roles?
PREP07 Test 2 PREP08 Test 2 According to the passage, Paczynski's theory presumes that if MACHO's constituted the Milky Way's dark halo, occasionally a MACHO would
Political Analyst: After the Soviet Union collapsed, some hoped that freedom would encourage Russians to multiply, but as a result of dislocation and insecurity, the Russian population continues to dwindle at the rate of 700,000 a year. The government proposes to address the problem with a wide range of financial incentives, along with investments in improved health care, road safety and the like. These are positive measures, but they have been tried before, to little avail. A better plan to reverse the population decline is to improve the country's governance in both the public and the private sphere. If a greater part of the population participated in important decisions and shared in the country's wealth, then larger families would result. In addition, if corruption and greed among the elite were curbed, public health would improve and average life expectancy would increase.The two boldfaced statements serve what function in the argument above?
PREP2012 A product that represents a clear technological advance over competing products can generally command a high price. Surprisingly, perhaps, the strategy to maximize overall profit from a new product is to charge less than the greatest price the market will bear. Many companies charge the maximum possible price for such a product, because they want to make as much profit as they can and technological advances tend to be quickly surpassed. The drawback is that large profits on the new product give competitors a strong incentive to quickly match the new product's capabilities.In the argument above, the two portions in boldface play which of the following roles?
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A nuclear test explosion was detonated recently in the Pacific Ocean, creating a substantial blast with a yield of 7.3 kilotons, or magnitude 5.1 on the Richter scale if it had been measured as an earthquake.
OG18 OG19 OG20 OG2022 The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which caused only a mild illness, they are immune from smallpox.
GWD PREP08 Test 2 Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process.
300难题 The passage would be most likely to appear in which of the following?
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Which of the following most accurately describes the organization of the passage?