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】

試題分析:本文是一篇說明文，介紹了熱帶雨林的一些情況。從生態(tài)學(xué)角度的科學(xué)描述和解釋就是潮濕的熱帶地區(qū)常綠高大的森林植被稱做為熱帶雨林，熱帶雨林是我們?nèi)祟惸酥琳麄�(gè)生物界生存活動(dòng)所不可缺少的重要條件，如果它不復(fù)存在，地球的環(huán)境氣候都將產(chǎn)生重大的變化，我們應(yīng)該為保護(hù)熱帶雨林而努力。

1. 細(xì)節(jié)理解題。根據(jù)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.判斷選D。

2. 詞義推斷題。根據(jù)文章倒數(shù)第二段內(nèi)容People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.可以判斷this指代上文提到的人們從砍伐樹木當(dāng)中受的損失要比獲得的利益多這種情況，選A。

3.推理判斷題。從文章末段 More than 25% of the medicines we use today come from plants in rainforests.可知人們使用的藥物中有25%是來自于熱帶雨林，由此判斷B選項(xiàng)正確。

4.主旨大意題。文章首段提出熱帶雨林的定義以及對(duì)環(huán)境的影響，第二段介紹了熱帶雨林的消失以及對(duì)氣候的影響，第三段解釋了熱帶雨林消失的原因，由此判斷本文講述的是關(guān)于熱帶雨林和環(huán)境的關(guān)系，選C。

考點(diǎn)：考查社會(huì)環(huán)境類短文閱讀。