A rainforest is an area cov...
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(资源)：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.
【小题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℃
【小题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.
【小题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
【小题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
【答案】
【小题1】B
【小题2】C
【小题3】D
【小题4】A
【答案解析】试题分析：热带雨林对世界环境有很大影响，因为他们能够调节气候，文章介绍了失去热带雨林的危害。
【小题1】细节理解题。文中提到because they can take in heat from the sun and adjust the climate,由此可知，雨林能调节气候是因为他们吸收了来自太阳的热量。与B项意思一致。
【小题2】词义猜测题。It指前一句的意思：People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit砍伐热带雨林带来好处，但是坏处更多。
与C项意思一致。
【小题3】推理判断题。最后一段的大意是：我们今天使用的药物的25%以上来自雨林中的植物。然而，被检测出他们 药用价值的热带雨林植物还不到1%。我们治愈某种疾病极有可能就在不断缩小的雨林里，与D项意思一致。
【小题4】主旨大意题。根据开头的Rainforests have a great effect on the world environment可知，雨林与环境的关系密切，所以选A
考点：考查环保类短文。
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