The postive integer k has exactly two positive prime factors,3 and 7.If k has a total of 6 positive factors,including 1 and k,what is the value of k? 1. 9 is a factor of k 2. 49 is not a factor of k
三.There is a widespread belief in the US and Western europe that young people have a smaller commitment to work and a career than their parents and grandparents and that the souce of the change lies in the collape of the work ethic. A. a smaller commitment to work and a career than their parents and grandparents B. less of a commitment to work and a career than their parents and grandparents C. a smaller commitment to work and a career than that of their parents and grandparents D. less of a commitment to work and a career than their parents and grandparents had E. a lessening of the commitment to work and a career than their parents and grandparents had
四. Discussion of greenhouse effects has usually focused on whether the Earth would harm and by how much,but climatologists have indicated all along that the most obivious effects, and those that would have the largest impact on people,would be extremes of temperature,precipitation and storminess. A. the most obivious effects, and those that would have the largest impact on people,would be extremes of temperature,precipitation and storminess. B. the effects that are the most obivious effects, extremes of temperature,precipitation and storminess,would be those impacting the most on people. C. those effects to have the largest impact on people,extremes of temperature,precipitation and storminess,are what are the most obivious effects. D. extremes of temperature,precipitation and storminess,the most obivious effects,that they would have the largest impact on people. E. extremes of temperature,precipitation and storminess,which are the most obivious effects,are those to impact the most on people.
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发表于 2009-12-25 20:02:39
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