Question

A rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely falling 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 : 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 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. bring about high rainfall throughout the world

C. rarely cause the temperature to drop lower than 16℃

D. absorb the heat from the sun, reducing the effect of heat from the sun on the earth

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.

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

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.

 

Answer 1

1.D

2.A

3.B

4.C

【解析】

试题分析:本文是一篇说明文，介绍了热带雨林的一些情况。从生态学角度的科学描述和解释就是潮湿的热带地区常绿高大的森林植被称做为热带雨林，热带雨林是我们人类乃至整个生物界生存活动所不可缺少的重要条件，如果它不复存在，地球的环境气候都将产生重大的变化，我们应该为保护热带雨林而努力。

1. 细节理解题。根据文章第一段Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate.判断选D。

2. 词义推断题。根据文章倒数第二段内容People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.可以判断this指代上文提到的人们从砍伐树木当中受的损失要比获得的利益多这种情况，选A。

3.推理判断题。从文章末段 More than 25% of the medicines we use today come from plants in rainforests.可知人们使用的药物中有25%是来自于热带雨林，由此判断B选项正确。

4.主旨大意题。文章首段提出热带雨林的定义以及对环境的影响，第二段介绍了热带雨林的消失以及对气候的影响，第三段解释了热带雨林消失的原因，由此判断本文讲述的是关于热带雨林和环境的关系，选C。

考点：考查社会环境类短文阅读。