61. Investigators concluded that human failure was not responsible for the fatal airplane crash last August, and since that time new and more stringent rules for identifying and reporting mechanical problems have been in effect. That accounts for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August.
Which one of the following is an assumption underlying the argument in the passage?
A. Airplane travel is still relatively safe, despite the increase in reported mechanical problems. B. Mechanical problems in airplanes have increased dramatically since last August. C. Mechanical problems in airplanes have not increased by 50 percent since last August. D. Airlines are less reluctant to report mechanical problems than they previously were. E. Mechanical problems in airplanes have become easier to detect since last August.
C 为什么啊？？？
58. Some people say that the scarcity of food is a function of the finite limits of the earth’s resources, coupled with a relentless rate of population growth. This analysis fails to recognize, however, that much of the world’s agricultural resources are used to feed livestock instead of people. In the United States, for example, almost one-half of the agricultural acreage is devoted to crops fed to livestock. A steer reduces twenty-one pounds of inexpensive grain to one pound of expensive meat. Thus, the scarcity of food is not merely a function of limited resources and population growth.
Which one of the following is an assumption that would allow the conclusion in the argument to be properly drawn?
A. eople prefer eating meat to eating grain. B. Meat is twenty-one times more expensive than grain. C. The limits of the earth’s agricultural resources are not finite. D. More than one-half of the agricultural acreage in the United States is devoted to drops fed to humans. E. Growing crops for human consumption on the acreage currently devoted to crops for livestock will yield more food for more people.
however, that much of the world’s agricultural resources are used to feed livestock instead of people 说明这些喂给动物的粮食比重很大，动物饲料这个function必须考虑在里面 E取非的话，被动物吃掉的粮食，不能够喂很多人，就说明饲料因素不占很大比重，可以不考虑
E. Growing crops for human consumption on the acreage currently devoted to crops for livestock will yield more food for more people. 现在用来种饲料的土地，如果用来种粮食，给人类提供更多的食物
E. Growing crops for human consumption on the acreage currently devoted to crops for livestock will yield more food for more people. 现在用来种饲料的土地，如果用来种粮食，给人类提供更多的食物
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发表于 2010-9-18 12:22:01
eople prefer eating meat to eating grain. 
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发表于 2010-9-19 07:04:43
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