5.Organic farming is a big-picture exercise.It's not only targeted at this season's results,but considers future generations.In the long run it makes better economic sense as well.But its main goal is to contribute to a healthier world.
Studies conducted all over the world have shown the effects that conventional chemical farming has on the environment.Certainly,chemical fertilizers,pesticides,and herbicides increase the quantity of a farm's production.They help produce more grains and vegetables.But at what cost?A Swiss study showed that organic farming produces an average of 20% less than conventional methods.But the organically grown food contained 50% less fertilizer and 97% less pesticides.
Though only a part of the amount of pesticides a farm uses actually does the job of killing bugs,all of it remains active in the soil for months or even years after application.Perhaps worse,each generation of pests is growing increasingly immune (免疫的)to the chemicals used.It's not even all about the food and the soil.The pesticides used in conventional agriculture are finally spilling their chemical residues(化學殘留) into the waterways.It affects wildlife,soil and ecosystems as a whole.According to a Worldwatch paper,Deep Trouble:The Hidden Threat of Groundwater Pollution,poisonous chemicals are polluting groundwater on every inhabited continent,endangering the world's most valuable supplies of freshwater.
Perhaps not so intuitive,organic farming affects the air."Organic agriculture can reduce greenhouse gas emissions by effectively locking more carbon into the soil rather than releasing it into the atmosphere,"found"Farming Systems Trial,"a 15-year study.Organic agriculture even uses 50% less energy than conventional farming.
How does organic farming deal with pests?Organic farmers intentionally build up populations of beneficial insects,such as ladybugs,that eat other pests and control the growth of insects.Wildflowers create green belts that control the spread of weeds and themselves encourage the beneficial insects.
Farmers have to stick to strict standards and practices to earn the label"organic."Looking forward,by promoting biological diversity and maintaining soil fertility,organic farming creates a natural balance that helps to get high quality food in healthy quantities year after year.
33.Which of the following can be the best title for the passage?B
A.The best ways to set up organic farming
B.Why organic farming benefits the environment
C.The history and development of organic farming
D.How to deal with pests and chemical residues
34.It can be known from the passage thatD.
A.applying pesticides will increase the number of pests
B.organic farming produces more greenhouse gas emissions
C.conventional farming is better than organic farming
D.the organically grown food does good to people's health
35.By writing Paragraph 3,the author mainly wants to tell usC.
A.the immune function of pests
B.the effect of chemical residues
C.the great harm of pesticides
D.the benefit of conventional agriculture.
分析 本文通過幾個方面說明有機農業(yè)為什么會對環(huán)境有好處.
解答 33.B主旨大意題.本文通過幾個方面說明有機農業(yè)為什么會對環(huán)境有好處.文章第一段為主題段,下面各段都是圍繞這一主題段進行說明的.
34.D推理判斷題.根據(jù)第二段最后一句But the organically grown food contained 50% less fertilizer and 97% less pesticides.可知,有機農產品含有的肥料少,含有的農藥更少,由此可以推斷,這種有機農產品對人的身體有益.
35.C 作者意圖猜測題.文章第三段說明應用農藥不僅會使害蟲產生免疫,而且還會污染水源,影響野生動物、土壤和生態(tài)系統(tǒng).這一切都是應用農藥所產生的巨大危害.故選C.
點評 做閱讀時經(jīng)常犯錯的主要原因是,僅憑讀過文章后殘留在腦海中的一絲印象來勾選答案,這樣便很容易掉入出題人故意設布下的題目陷阱.所謂閱讀理解,對于題目的理解一定要忠實于原文,因此,每一道題都應該與原文作全面的對比與核查,再得出答案.也就是說,閱讀理解的每一道題目,在原文都應該有明確的出處,我們把這一出處叫做原文相關句,(1)排除與原文相關句主題不一致的選項(2)排除與原文相關句態(tài)度相反的選項 (3)排除用于過于極端或負面的選項(4)注意結合文章主旨和主題去排除.