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　　1、Which of the following most logically completes the argument below?

　　Although the number of large artificial satellites orbiting the Earth is small compared to the number of small pieces of debris in orbit, the large satellites interfere more seriously with telescope observations because of the strong reflections they produce. Because many of those large satellites have ceased to function, the proposal has recently been made to eliminate interference from nonfunctioning satellites by exploding them in space. This proposal, however, is ill conceived, since .

　　(A) many nonfunctioning satellites remain in orbit for years

　　(B) for satellites that have ceased to function, repairing them while they are in orbit would be prohibitively expensive

　　(C) there are no known previous instances of satellites’ having been exploded on purpose

　　(D) the only way to make telescope observations without any interference from debris in orbit is to use telescopes launched into extremely high orbits around the Earth

　　(E) a greatly increased number of small particles in Earth’s orbit would result in a blanket of reflections that would make certain valuable telescope observations impossible

　　正確選項(xiàng)：

　　E

　　證明這種做法并不能減少對(duì)太空望遠(yuǎn)鏡觀測的影響。

　　逐項(xiàng)分析：

　　A、許多不工作的人造衛(wèi)星仍然在軌道上運(yùn)轉(zhuǎn)數(shù)年。正是因?yàn)榇�，我們才要�?duì)其進(jìn)行爆破。

　　B、對(duì)于已經(jīng)停止工作的衛(wèi)星，在軌道上對(duì)其進(jìn)行修復(fù)的成本很高。無關(guān)項(xiàng)。

　　C、以前沒有人工爆破衛(wèi)星的先例。無關(guān)項(xiàng)。以前沒有不代表以后沒有。

　　D、想讓太空望遠(yuǎn)鏡觀測無干擾的唯一辦法是使用發(fā)射到離地球很遠(yuǎn)的軌道中的太空望遠(yuǎn)鏡。無關(guān)項(xiàng)。

　　E、正確選項(xiàng)。對(duì)人造衛(wèi)星進(jìn)行爆破會(huì)產(chǎn)生很多的小碎片，而地球周圍過多的小碎片會(huì)給觀測帶來不好的影響。

　　2、Suncorp, a new corporation with limited funds, has been clearing large sections of the tropical Amazon forest for cattle ranching. This practice continues even though greater profits can be made from rubber tapping, which does not destroy the forest, than from cattle ranching, which does destroy the forest.

　　Which of the following, if true, most helps to explain why Suncorp has been pursuing the less profitable of the two economic activities mentioned above?

　　(A) The soil of the Amazon forest is very rich in nutrients that are important in the development of grazing lands.

　　(B) Cattle-ranching operations that are located in tropical climates are more profitable than cattle-ranching operations that are located in cold-weather climates.

　　(C) In certain districts, profits made from cattle ranching are more heavily taxed than profits made from any other industry.

　　(D) Some of the cattle that are raised on land cleared in the Amazon are killed by wildcats.

　　(E) The amount of money required to begin a rubber-tapping operation is twice as high as the amount needed to begin a cattle ranch.

　　正確選項(xiàng)：

　　E

　　找到放牧業(yè)比橡膠業(yè)更好的地方。

　　逐項(xiàng)分析：

　　A、A森林的土壤營養(yǎng)素十分豐富，而這種營養(yǎng)素對(duì)蓄牧地發(fā)展非常重要。無比較，排除。

　　B、畜牧業(yè)在不同地區(qū)之間的比較，排除。

　　C、在一些地方，蓄牧業(yè)的利潤比其他產(chǎn)業(yè)的利潤會(huì)被征收更多的稅。無關(guān)項(xiàng)。

　　D、這和S公司的選擇是反的，如果此陳述為真，會(huì)削弱S公司的選擇。

　　E、正確選項(xiàng)，說明了本地區(qū)畜牧業(yè)比橡膠業(yè)的優(yōu)勢。