9．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（資源）：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．
63．Rainforests can help to adjust the climate because theyC．
A．bring about high rainfall throughout the world
B．reflect more heat into the atmosphere
C．reduce the effect of heat from the sun on the earth
D．rarely cause the temperature to drop lower than l6℃
64．What does the word"this"underlined in the third paragraph refer to？D
A．Humans have begun destroying rainforests．
B．People have a strong desire for resources．
C．Much carbon dioxide comes from burning rainforests．
D．We will lose much more than we can gain．
65．It can be inferred from the text thatA．
A．there is great medicine potential in rainforests
B．we can get enough resources without rainforests
C．the level of annual rainfall affects wind patterns
D．we will grow fewer kinds of crops in the gained land
66．What might be the best title for the text？B
A．How to Save Rainforests
B．Rainforests and the Environment
C．How to Protect Nature
D．Rainforests and Medical Development．
分析 本文敘述了熱帶雨林在人們生活中的重要作用，它們能吸收太陽光調(diào)節(jié)地球上的溫度，如果沒有它們?nèi)祟悤?huì)得疾病，給人類帶來大的災(zāi)難，并且它們還能提供一些藥用的植物藥材，來為人類治病，因此，我們要保護(hù)熱帶雨林，不要濫墾濫伐．
解答 63．C．細(xì)節(jié)理解題．根據(jù)Rainforests have agreat effect on the world environment because they can take in heat from thesun and adjust the climate．熱帶雨林有一個(gè)很大的影響對(duì)于世界環(huán)境，因?yàn)樗麄兡芪諄碜蕴柕臒崃浚{(diào)節(jié)氣候．故選C．
64．D．詞義猜測(cè)題．根據(jù)People obviouslyhave a need for the resources we gain from cutting trees but we will suffermuch more than we will benefit可知人們失去的會(huì)比得到的多．故選D．
65．A．推理判斷題．根據(jù)More than 25% of the medicines we use today come from plants inrainforests．However，fewer than l%ofrainforest plants have been examined for their medical value．It is extremelylikely that our best chance to cure diseases lies somewhere in the world'sshrinking rainforests．熱帶雨林里有很多的藥用植物供我們開采利用，故選A．
66．B．主旨大意題．本文是在向讀者介紹熱帶雨林的減少會(huì)對(duì)環(huán)境造成的影響，呼吁人們要保護(hù)熱帶雨林，進(jìn)而保護(hù)整個(gè)人類生存的環(huán)境；故選B．
點(diǎn)評(píng) 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力，做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確的選擇．在做推理判斷題不要以個(gè)人的主觀想象代替文章的事實(shí)，要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷．
