题目内容
【题目】A rainforest is an area 【1】 (cover) by tall trees with the total high rainfall spreading quite equally through the year. Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate.【2】 the forest cover, these areas would reflect more heat into the atmosphere,【3】 (warm) 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 【4】 (begin) destroying rainforests in search of three major resources: land for crops, wood for paper and other products, land for raising farm 【5】 (animal). This action affects the environment as a whole. For example, a lot of carbon dioxide in the air comes from burning the rainforests. People 【6】 (obvious) have a need for the resources we gain from cutting trees,【7】 we will suffer much more than we will benefit.
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 【8】 (medicine) value. It is extremely likely 【9】 our best chance to cure diseases 【10】 (lie) somewhere in the world’s shrinking rainforests.
【答案】
【1】covered
【2】Without
【3】warming
【4】have begun
【5】animals
【6】obviously
【7】but
【8】medical
【9】that
【10】lies
【解析】本文叙述了热带雨林在人们生活中的重要作用，它们能吸收太阳光调节地球上的温度，减少人类得病，还能提供一些药用的植物药材为人类治病，因此，我们要保护热带雨林，不要滥垦滥伐。
【1】句意：被高树覆盖的地区。此处是过去分词做后置定语，可知答案为covered。
【2】句意：没有森林的覆盖，这些区域会反射更多的热量进入大气层，温暖世界的其他地方。此空填介词without。
【3】句意：没有森林的覆盖，这些区域会反射更多的热量进入大气层，温暖世界的其他地方。此处是现在分词做自然的结果状语，故答案为warming。
【4】根据In the past hundred years,可知句子用现在完成时态，主语是humans，复数形式，故答案为have begun。
【5】句意：养农家牲畜的土地。根据句意可知此处应该用名词的复数形式，答案为animals。
【6】副词修饰动词，故答案为obviously。
【7】句意：人们显然需要我们从砍伐树木中获得的资源，但是我们将遭受比我们受益更多的痛苦。根据上下文可知是转折关系，答案为but。
【8】句意：医学的价值。形容词修饰名词，答案为medical。
【9】固定句式：It is likely that---，很可能---，故答案为that。
【10】句意：很可能我们治愈疾病的最好机会是在世界上雨林萎缩的某处。根据句意可知句子用一般现在时态，主语是chance，单数第三人称形式，故答案为lies。
