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 本文作者通過(guò)講述地球以及地球上各種生物的形成過(guò)程,重在指出生命是否能在地球上繼續(xù)生存數(shù)百萬(wàn)年,將取決于人們能否解決二氧化碳排放量過(guò)多的問題.

解答 71.dust;72.exploded;73.time;74.harmful;75.multiplied;76.development;77.spread;78.much;79.prevents;80.depend.
71.dust 考查名詞  a  cloud of dust 是一團(tuán)塵埃的意思.
72.exploded 考查動(dòng)詞  explode with 爆發(fā),屬于固定搭配.
73.time 考查名詞   in time 屬于固定搭配  此處意思為"最終,最后".
74.harmful考查形容詞   Gases是名詞所以要使用形容詞修飾名詞,意思為"有害的".
75.multiplied 考查動(dòng)詞   multiply的意思是"繁殖,增加",此處應(yīng)該使用一般過(guò)去時(shí).
76.development考查名詞用法.the development of??????發(fā)展,因?yàn)闄M線前面有冠詞the,只有冠詞修飾名詞,所以劃?rùn)M線的詞性是名詞.
77.spread考查動(dòng)詞  句意為:這個(gè)聰明的動(dòng)物在地球上到處蔓延開來(lái),應(yīng)該填spread,此處是一般過(guò)去時(shí).
78.much 考查副詞   句意為:他們把太多的二氧化碳排放到了空氣中,所以填much.
79.prevents考查動(dòng)詞  句意為:這阻止了熱量的逃逸,prevent…from doing 所以填prevents.
80.depend.考查動(dòng)詞搭配  depend on 依賴,取決于.

點(diǎn)評(píng) 考生在對(duì)題目進(jìn)行作答之前,要先對(duì)題干進(jìn)行詳細(xì)閱讀,檢查題目中是否有提示詞語(yǔ)存在;而后判斷出所填詞語(yǔ)在句子中所充當(dāng)?shù)木渥映煞郑,主語(yǔ)、謂語(yǔ)等;最后根據(jù)其所充當(dāng)?shù)木渥映煞,加之其所處句子的語(yǔ)態(tài)等,選擇詞語(yǔ)的正確形式,例如,動(dòng)詞的現(xiàn)在分詞或者過(guò)去分詞,或者形容詞的比較或者最高級(jí)的使用等.
在句子中沒有提示詞或者標(biāo)志詞存在時(shí),考生要根據(jù)句子中所填詞語(yǔ)的位置,判斷所填詞語(yǔ)的詞性,例如,連接詞、定冠詞或者不定冠詞、代詞或者介詞等.定冠詞以及不定冠詞的位置通常在名詞之前,起到對(duì)名詞進(jìn)行限制的作用.而代詞則分為形容詞性物主代詞、名詞性代詞、指示代詞和不定代詞等.在運(yùn)用介詞的時(shí)候,往往考查介詞的固定搭配,其中包括動(dòng)詞、形容詞等與介詞的搭配.

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