A rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dipping below 16℃.Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate.Without the forest cover,these areas would reflect more heat into the atmosphere,warming the rest of the world.Losing the rainforests may also influence wind and rainfall patterns,potentially causing certain natural disasters all over the world.
In the past hundred years,humans have begun destroying rainforests in search of three major resources(資源):land for crops,wood for paper and other products,land for raising farm animals.This action affects the environment as a whole.For example,a lot of carbon dioxide(二氧化碳)in the air comes from burning the rainforests.People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.
There are two main reasons for this.Firstly,when people cut down trees,generally they can only use the land for a year or two.Secondly,cutting large sections of rainforests may provide a good supply of wood right now,but in the long run it actually reduces the world's wood supply.
Rainforests are often called the world's drug store.More than 25% of the medicines we use today come from plants in rainforests.However,fewer than 1%of rainforest plants have been examined for their medical value.It is extremely likely that our best chance to cure diseases lies somewhere in the world's shrinking rainforests.
1.Rainforests can help to adjust the climate because they ______.
A.reflect more heat into the atmosphere
B.reduce the effect of heat from the sun on the earth
C.bring about high rainfall throughout the world
D.rarely cause the temperature to drop lower than 16℃
2.What does the word“this”underlined in the third paragraph refer to?
A.Humans have begun destroying rainforests.
B.People have a strong desire for resources.
C.We will lose much more than we can gain.
D.Much carbon dioxide comes from burning rainforests.
3.It can be inferred from the text that ______.
A.we can get enough resources without rainforests
B.we will grow fewer kinds of crops in the gained land
C.the level of annual rainfall affects wind patterns
D.there is great medicine potential in rainforests
4.What might be the best title for the text?
A.Rainforests and the Environment
B.How to Save Rainforests
C.How to Protect Nature
D.Rainforests and Medical Development
1.B
2.C
3.D
4.A
【解析】
試題分析:本文主要介紹了熱帶雨林對(duì)于環(huán)境和人類的相互影響,他對(duì)于環(huán)境有保護(hù)和調(diào)節(jié)作用,以及熱帶雨林中的對(duì)于人類有益的藥物原材料,但是人們對(duì)于熱帶雨林的破壞又對(duì)環(huán)境造成了很多不好的影響。
1. 們可以在第一段對(duì)于雨林的總括里去找到答案。根據(jù)Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate.可知:熱帶雨林對(duì)環(huán)境有巨大的影響,因?yàn)樗麄兛梢晕贞?yáng)光并且調(diào)節(jié)氣候。故選B。
2. obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.可知人們從砍伐樹(shù)木中輕而易舉的獲得對(duì)于資源的需要,但是比起我們所獲得的我們所遭受的損失卻更多。故選C。
3. Places自然段中Rainforests are often called the world's drug store.More than 25% of the medicines we use today come from plants in rainforests.可以得知:熱帶雨林也被稱作世界醫(yī)藥寶庫(kù),因?yàn)榻裉煳覀兯褂玫某^(guò)25%的藥材都來(lái)自于熱帶雨林中的植物。故選D。
4. have a great effect on the world environment,可知熱帶雨林對(duì)于環(huán)境有巨大的影響,在文中二三四自然段分別敘述了熱帶雨林對(duì)于人類的影響及對(duì)于藥材的貢獻(xiàn)。故選A。
考點(diǎn):考查說(shuō)明文閱讀。
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