A rainforest is an area covered by tall trees with the total high rainfall spreading quite

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 l6℃. 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 l％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 atmosphereB．bring about high rainfall throughout the worldC．rarely cause the temperature to drop lower than l6℃D．reduce the effect of heat from the sun on the earth【小题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.【小题3】It can be inferred from the text thatA．we can get enough resources without rainforestsB．there is great medicine potential in rainforestsC．we will grow fewer kinds of crops in the gained landD．the level of annual rainfall affects wind patterns【小题4】What might be the best title for the text?A．How to Save RainforestsB．How to Protect NatureC．Rainforests and the EnvironmentD．Rainforests and Medical DevelopmentD

(答案→)D 解析：【小题1】本题考查细节理解题。第一自然段Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate．得出答案。【小题2】本题考查细节理解题。第二自然段People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.了解到答案。【小题3】本题考查主旨大意题。浏览全文得出答案。【小题4】本题考查推理判断题。浏览全文最终得出答案。

就是这个解释