【題目】As almost everyone knows, 【1】(become) extinct is to be gone forever. Natural extinction happens when a species declines in numbers gradually. Even before man's arrival on Earth, some species had died out quite 【2】(natural).

The ease of the dinosaurs is【3】most well-known example of natural extinction.【4】(they) disappearance is a natural one and new species of animals evolve (進(jìn)化）to replace them.

The rate of extinction 【5】(speed) up unnaturally over the last 400 years.【6】(rise) sharply since 1900. This increase in the rate of extinction is directly related 【7】the increase in the human population over the same period of time. Vast numbers of humans have caused great damage to the planet, as humans have taken over a great many wild 【8】(habitat), forcing animals and plants into smaller and【9】(small) areas, until some of them have become extinct. We have also polluted our planet.【10】makes it unfit for wildlife. These causes of extinction are known as indirect destruction.

【答案】

【1】to become。

【2】naturally

【3】the

【4】Their

【5】has speeded

【6】rising

【7】to

【8】habitats

【9】smaller

【10】which

【解析】近四百年來物種在急劇的消失，人口的增長更加加劇了這一現(xiàn)象，人類不斷地?cái)U(kuò)大生活空間，致使動(dòng)植物的棲息地越來越小，甚至某些物種滅絕了。另外人類造成的污染也間接的導(dǎo)致了物種的滅絕。

【1】考查非謂語動(dòng)詞。句意：幾乎每個(gè)人都知道，滅絕是永遠(yuǎn)消失。根據(jù)英語對稱原則，表語為動(dòng)詞不定式，故主語應(yīng)為不定式。故填to become。

【2】考查副詞。句意：甚至在人類出現(xiàn)在地球之前，有些物種已經(jīng)很自然地滅絕了。副詞修飾動(dòng)詞短語die out，故用naturally。

【3】考查冠詞。句意：恐龍滅絕是最著名的自然滅絕的例子。形容詞的最高級前加定冠詞the。

【4】考查代詞。句意：它們的消失是自然的，新的動(dòng)物物種進(jìn)化會(huì)來代替他們。由空后的名詞disappearance可知此處用形容詞性物主代詞。故填Their。

【5】考查動(dòng)詞時(shí)態(tài)。句意：在過去的400年里，物種滅絕異常加速了。由over the last 400 years 可知此處用現(xiàn)在完成時(shí)態(tài)。故填has speeded。

【6】考查非謂語動(dòng)詞。句意：從1900年以來急速上升。rise與邏輯主語the rate of extinction 是主動(dòng)關(guān)系。故填rising。

【7】考查介詞。句意：在同一時(shí)期，滅絕率的增長直接導(dǎo)致了人口的增長。be related to 與…有關(guān)。為固定搭配。故填介詞to。

【8】考查名詞的數(shù)。句意：大量的人類已經(jīng)對地球造成了巨大的破壞，因?yàn)槿祟愐呀?jīng)接管了許多野生的棲息地，迫使動(dòng)物和植物進(jìn)入越來越小的區(qū)域，直到其中一些已經(jīng)滅絕。a great many 后加可數(shù)名詞的復(fù)數(shù)。故填habitats。

【9】考查形容詞的比較級。句意：大量的人類已經(jīng)對地球造成了巨大的破壞，因?yàn)槿祟愐呀?jīng)接管了許多野生的棲息地，迫使動(dòng)物和植物進(jìn)入越來越小的區(qū)域，直到其中一些已經(jīng)滅絕。and連接兩個(gè)比較級，意為“越來越……”。故填smaller。

【10】考查定語從句。句意：我們也污染了我們的地球，這使得它不適合野生動(dòng)物。先行詞為planet。故填關(guān)系代詞which。

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