GMAT逻辑题练习及答案(351)

2017-08-09 08:43

来源：新东方在线

作者：

　　GMAT逻辑题目:

　　【逻辑】

　　Scientists are discussing ways to remove excess carbondioxide from the atmosphere by increasing the amount that is absorbed by plantlife. One plan to accomplish this is toestablish giant floating seaweed farms in the oceans. When the seaweed plants die, they will bedisposed of by being burned for fuel.

　　Which of the following, if true, would indicate the mostserious weakness in the plan above?

　　(A) Some areas of ocean in the Southern Hemisphere do notcontain sufficient nutrients to support large seaweed farms.

　　(B) When a seaweed plant is burned, it releases an amountof carbon dioxide comparable to the amount it has absorbed in its lifetime.

　　(C) Even if seaweed farms prove effective, some peoplewill be reluctant to switch to this new fuel.

　　(D) Each year about seven billion tons of carbon dioxideare released into the atmosphere but only about five billion tons are absorbedby plant life.

　　(E) Seaweed farms would make more money by farmingseaweed to sell as nutritional supplements than by farming seaweed to sell asfuel.

　　参考答案: B

　　思路：A：模糊词some。它的意思是说在某些地方措施不可行。这不是我们要的答案;

　　C：模糊词some。它的意思是说一些人犹豫用seaweed。本质也是措施不可行。不对;

　　D：就算是只有five billion tons被吸收，但至少减少了一部分carbon dioxide;

　　E：无关比较，比的对象文中没有出现。

　　B：烧seaweed会放出carbon dioxide等于其吸收的，说明在实施这一措施的过程中，此措施本身会产生一个坏处，导致不能减少carbon dioxide的量，正确答案。

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