lsat-5-4-10 lsat-5-4-11

Nature constantly adjusts the atmospheric carbon level. An increase in the level causes the atmosphere to hold more heat, which causes more water to evaporate from the oceans, which causes increased rain. Rain washes some carbon from the air into the oceans, where it eventually becomes part of the seabed. A decrease in atmospheric carbon causes the atmosphere to hold less heat, which causes decreased evaporation from the oceans, which causes less rain, and thus less carbon is washed into the oceans. Yet some environmentalists worry that burning fossil fuels may raise atmospheric carbon to a dangerous level. It is true that a sustained increase would threaten human life. But the environmentalists should relax—nature will continually adjust the carbon level.

题目说:

自然不断的调节大气碳的水平。

碳量增加--大气吸收更多热量--热量导致更多水从海中蒸发--导致会下更多的雨--雨水洗刷大气中的碳，并将碳带到海底。

大气中碳量减少--大气吸收较少的热量--导致较少的水从海中蒸发--导致较少的雨水--因此较少的碳冲如海中。

一些环境学家担心，烧汽油会导致大气中的碳含量到一个危险的水平，以至威胁人类的安全，但是环境学家应该放心，---自然会不断调节碳含量的。

10.   Each of the following can be inferred from the information in the passage EXCEPT:

(A) A decrease in the level of atmospheric heat causes a decrease in the amount of carbon that rain washes into the oceans from the air.

(B) An increase in the level of carbon in the atmosphere causes increased evaporation of ocean water.

(C) An increase in the level of atmospheric heat causes increased rainfall.

(D) A decrease in the level of carbon in the atmosphere causes decreased evaporation of ocean water.（E）

(E) A decrease in the level of atmospheric heat causes a decrease in the level of carbon in the atmosphere.

做题的时候在AE之间犹豫，现在好象明白些了，是不是E完全是相反的，大气热量的减少不该从大气碳量减少推出，而是碳量减少推出大气热量减少。

11.   Which one of the following, if true, would most weaken the argument in the passage?

(A) Plant life cannot survive without atmospheric carbon.

(B) It is not clear that breathing excess carbon in the atmosphere will have a negative effect on human life.

(C) Carbon is part of the chemical “blanket” that keeps the Earth warm enough to sustain human life.

(D) Breathing by animals releases almost 30 times as much carbon as does the burning of fossil fuels.（E）

(E) The natural adjustment process, which occurs over millions of years, allows wide fluctuations in the carbon level in the short term.

11题，我选了D，为什么不对？E选项中的in the short term是什么意思？整个Ｅ　选项翻译过来是什么？