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9.The earth was just a cloud of (71)dustafter the"Big Bang".The earth (72)explodedloudly with fire and rock.They were in (73)timeto produce many things,which were to make the earth's atmosphere.As the earth cooled down,water began to appear on its surface.It allowed the earth to dissolve (74)harmfulgases.Then life began to develop.
The first small plants (75)multipliedand filled the oceans and seas with oxygen.This encouraged the (76)developmentof early shellfish and fish.Land animals such as insects,reptiles and dinosaurs and so on appeared after green plants appeared.Small clever animals (77)spreadall over the earth.They are putting too (78)muchcarbon dioxide into the atmosphere,which (79)preventsheat from escaping the earth into space.Whether life will continue on the earth for millions of years to come will (80)dependon whether this problem can be solved.

分析 本文作者通过讲述地球以及地球上各种生物的形成过程,重在指出生命是否能在地球上继续生存数百万年,将取决于人们能否解决二氧化碳排放量过多的问题.

解答 71.dust;72.exploded;73.time;74.harmful;75.multiplied;76.development;77.spread;78.much;79.prevents;80.depend.
71.dust 考查名词  a  cloud of dust 是一团尘埃的意思.
72.exploded 考查动词  explode with 爆发,属于固定搭配.
73.time 考查名词   in time 属于固定搭配  此处意思为"最终,最后".
74.harmful考查形容词   Gases是名词所以要使用形容词修饰名词,意思为"有害的".
75.multiplied 考查动词   multiply的意思是"繁殖,增加",此处应该使用一般过去时.
76.development考查名词用法.the development of??????发展,因为横线前面有冠词the,只有冠词修饰名词,所以划横线的词性是名词.
77.spread考查动词  句意为:这个聪明的动物在地球上到处蔓延开来,应该填spread,此处是一般过去时.
78.much 考查副词   句意为:他们把太多的二氧化碳排放到了空气中,所以填much.
79.prevents考查动词  句意为:这阻止了热量的逃逸,prevent…from doing 所以填prevents.
80.depend.考查动词搭配  depend on 依赖,取决于.

点评 考生在对题目进行作答之前,要先对题干进行详细阅读,检查题目中是否有提示词语存在;而后判断出所填词语在句子中所充当的句子成分,例如,主语、谓语等;最后根据其所充当的句子成分,加之其所处句子的语态等,选择词语的正确形式,例如,动词的现在分词或者过去分词,或者形容词的比较或者最高级的使用等.
在句子中没有提示词或者标志词存在时,考生要根据句子中所填词语的位置,判断所填词语的词性,例如,连接词、定冠词或者不定冠词、代词或者介词等.定冠词以及不定冠词的位置通常在名词之前,起到对名词进行限制的作用.而代词则分为形容词性物主代词、名词性代词、指示代词和不定代词等.在运用介词的时候,往往考查介词的固定搭配,其中包括动词、形容词等与介词的搭配.

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