Question

【题目】七选五

根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Trees around us are extremely important and have always been necessary for improving the human conditions. Our existing forests and trees we plant work to make a better world. 1 Here is a short list of main reasons trees are necessary for improving our living conditions.

●Trees produce oxygen

2 A leafy tree produces as much oxygen in a season as 10 people inhale in a year. What many people don’t realize is that the forest also acts as a giant filter (过滤器) that cleans the air we breathe. Trees help clean the air by preventing airborne particles, reducing heat, and absorbing such pollutants.

●Trees clean the soil

The term phytoremediation(植物修复) is a fancy word for the absorption of dangerous chemicals and other pollutants that have entered the soil. 3 Trees filter sewage and farm chemicals, reduce the effects of animal wastes, clean roadside spills and so on.

●Trees are carbon sinks

To produce its food, a tree absorbs and locks away carbon dioxide in the wood, roots and leaves. Carbon dioxide is a global warming suspect. 4 This lockingup process ＂stores＂ carbon as wood and not as a ＂greenhouse＂ gas.

● 5

Trees block urban noise almost as effectively as stone walls. Trees, planted at strategic points in a neighborhood or around your house, can reduce major noises from freeways and airports.

A. Trees help clean the sky.

B. Trees control noise pollution.

C. We could not exist as we do if there were no trees.

D. Man has been planting trees to make the planet a more beautiful world.

E. A forest is a carbon storage area that can lock up as much carbon as it produces.

F. Trees can either store harmful pollutants or change the pollutants into less harmful forms.

G. The modern human community has other more practical reasons to admire and honor trees.

Answer 1

【答案】

【1】G

【2】C

【3】F

【4】E

【5】B

【解析】

【语篇解读】本文主要说明了树对人类的生存环境起着重要的作用。

【1】空格前句说的是地球上的自然林和我们种植的树木一起创造更好的世界，空格后面说这里有一个关于树木对改善我们的生存环境非常必要的重要原因的简单列表，所以此处应该选择具有承上启下作用的句子，说明当今人类还有更现实的理由敬佩、珍视树木。

【2】此段主要说明树木产生氧气净化空气，所以此处是说树所生产的氧气帮助我们生存。

【3】 由此空后面的内容可知，树木会过滤污水和农业用药，减少动物粪便的影响以及清理路边的污物等，所以此处应选择一句来概括树木在污染方面的作用。

【4】 根据空前的＂locks away carbon dioxide＂和空后的＂This-locking-up process ‘stores’ carbon＂可知，此处应选择一句包含这两项信息。

【5】本段主要讲了树木对噪声控制的作用，所以此处应该是对此进行概括，即树木可以减少噪音污染。