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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.
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.
[语篇解读] 文章论述了热带雨林的重要作用以及对环境的影响。
1.Rainforests can help to adjust the climate because they________.
A. reflect more heat into the atmosphere
B. bring about high rainfall throughout the world
C. rarely cause the temperature to drop lower than 16℃
D. reduce the effect of heat from the sun on the earth
[解析] 因果判断题。由文章第一段内容可以得出答案。 [答案] D
2.What does the word “this” underlined in the third paragraph refer to?
A. We will lose much more than we can gain.
B. Humans have begun destroying rainforests.
C. People have a strong desire for resources.
D. Much carbon dioxide comes from burning rainforests.
[解析] 由上下文内容可知，A项正确。
[答案] A
3.It can be inferred from the text that________.
A. we can get enough resources without rainforests
B. there is great medicine potential in rainforests
C. we will grow fewer kinds of crops in the gained land
D. the level of annual rainfall affects wind patterns
[解析] 推测判断题。由文章最后一段内容即可得出答案。 [答案] B
4.What might be the best title for the text?
A. How to Save Rainforests
B. How to Protect Nature
C. Rainforests and the Environment
D. Rainforests and Medical Development
[解析] 主旨大意题。整篇文章主要论述了热带雨林的重要作用以及砍伐热带雨林对环境所造成的影响。
[答案] C
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