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和请教三道题 GWD1-Q17: The spacing of the four holes on a fragment of a bone flute excavated at a Neanderthal campsite is just what is required to play the third through sixth notes of the diatonic scale—the seven-note musical scale used in much of Western music since the Renaissance. Musicologists therefore hypothesize that the diatonic musical scale was developed and used thousands of years before it was adopted by Western musicians. Which of the following, if true, most strongly supports the hypothesis?
A. Bone flutes were probably the only musical instrument made by Neanderthals. B. No musical instrument that is known to have used a diatomic scale is of an earlier date than the flute found at the Neanderthal campsite. C. The flute was made from a cave-bear bone and the campsite at which the flute fragment was excavated was in a cave that also contained skeletal remains of cave bears. D. Flutes are the simplest wind instrument that can be constructed to allow playing a diatonic scale. E. The cave-bear leg bone used to make the Neanderthal flute would have been long enough to make a flute capable of playing a complete diatonic scale. 我选C,答案选E不明白 GWD1-Q18: It is illegal to advertise prescription medications in Hedland except in professional medical journals or by mail directly to physicians. A proposed law would allow general advertising of prescription medications. Opponents object that, in general, laypersons lack the specialized knowledge to evaluate such advertisements and might ask their physicians for inappropriate medications. But since physicians have the final say as to whether to prescribe a medication for a patient, the objection provides no grounds for concern.
Which of the following would it be most useful to establish in order to evaluate the argument?
A. Whether nonprescription medications can interact with and block the action of any prescription medications that could be advertised to the general public B. Whether most prescription medication advertisements directed at the general public would be advertisements for recently developed medications newly available by prescription C. Whether prescription medication advertisements directed at the general public would appear on television and radio as well as in print D. Whether physicians are more likely to pay attention to advertising directed to the general public than to advertising directed to physicians E. Whether physicians are likely to succumb to pressure from patients to prescribe inappropriate medications 我选D,答案选E不明白 GWD1-Q33：A company plans to develop a prototype weeding machine that uses cutting blades with optical sensors and microprocessors that distinguish weeds from crop plants by differences in shade of color. The inventor of the machine claims that it will reduce labor costs by virtually eliminating the need for manual weeding. Which of the following is a consideration in favor of the company’s implementing its plan to develop the prototype?
A. There is a considerable degree of variation in shade of color between weeds of different species. B. The shade of color of some plants tends to change appreciably over the course of their growing season. C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds. D. Selection and genetic manipulation allow plants of virtually any species to be economically bred to have a distinctive shade of color without altering their other characteristics. E. Farm laborers who are responsible for the manual weeding of crops carry out other agricultural duties at times in the growing season when extensive weeding is not necessary. 我选A，答案选D,不明白。。。 谢谢！
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发表于 2009-3-28 15:10:00
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