GMAT逻辑题练习及答案(443)

2017-11-17 09:44

来源：新东方在线

作者：

　　Because of increases in the price of oil and because ofgovernment policies promoting energy conservation, the use of oil to heat homesfell by 40 percent from 1970 to the present, and many homeowners switched tonatural gas for heating. Because switching to natural gas involved investing inequipment, a significant switch back to oil in the near future is unlikely.

　　The prediction that ends the passage would-be mostseriously called into question if it were true that in the last few years.

　　A. the price of natural gas to heat homeshas remained constant, while the cost of equipment to heat homes with naturalgas has fallen sharply.

　　B. the price of home heating oilhas remained constant, while the cost of equipment to heat home with naturalgas has risen sharply.

　　C. the cost of equipment to heathomes with natural gas has fallen sharply, while the price of home heating oilhas fallen to 1970 levels.

　　D. the cost of equipment to heat homes withoil has fallen sharply, while the price of heating with oil has fallen belowthe price of heating with natural gas

　　E. the use of oil to heat homeshas continued to decline, while the price of heating oil has fallen to 1970levels

　　思路：演绎题里，若结论中有比较的，则答案中也应该有比较。此处的结论中有“用oil好，还是用gas好”的比较，所以答案中必须有oil和gas的比较。

　　A. 只有gas和gas equipment的过去与现在的自身的比较，故不对。

　　B. 只有oil的过去与现在的自身的比较;gas equipment的过去与现在的自身比较。不对。

　　C. 与B的分析相同。

　　D. 有oil与gas的price的比较gas equipment的过去与现在的比较，说明了用oil比用gas便宜，而且也提到了oil equipment的造价急剧下降，所以用oil会比用gas好，因此switch back to oil是合算的，是likely的，对文章起到weaken的作用。

　　E. 只有oil自身的比较，不对。

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