【題目】The world’s wildlife population【1】 (suffer) a devastating loss of almost three 【2】(five)since 1970, says a new report by the Zoology Society of London and the World Wildlife Foundation. According to its findings, animals 【3】 (live) in lakes, rivers and wetlands are the biggest victims. The report also suggests that vertebrate(脊椎動物)populations have continued to decline 【4】(steady)by around two percent every year.

Obviously, humans know 【5】the causes to the changes are, among which human activity and climate change are mainly to 【6】(blame)---habitat loss, wildlife trade and pollution, says the report.

Te researchers collected data from【7】 (govern) statistics, scientific studies and NGO reports, covering 3,700 different species of animals, which represent about six percent of the total number of vertebrates in the world.

The report has also drawn criticism, 【8】some scientists arguing that the data on 【9】it is based is not wide and representative enough to generate 【10】 single number for the decline of wildlife worldwide.

【答案】

【1】has suffered

【2】fifths

【3】living

【4】steadily

【5】what

【6】blame

【7】government

【8】with

【9】which

【10】a

【解析】本文論述的是有關世界范圍的野生動物下降的問題。

【1】根據(jù)since 1970自從１９７０年以來，可知句子用現(xiàn)在完成時態(tài)，population是句子主語，單數(shù)第三人稱形式，故答案為has suffered。

【2】此處是分數(shù)的表達，四分之三，分子用基數(shù)詞，分母用序數(shù)詞的復數(shù)形式，故答案為fifths。

【3】句意：生活在湖、河和沼澤地的動物。此處是現(xiàn)在分詞做后置定語，答案為ｌｉｖｉｎｇ。

【4】此處是副詞修飾動詞，答案為steadily。

【5】句意：人類知道變化的起因是什么。ｗｈａｔ引導賓語從從句，其雙重作用。

【6】句意：人類活動和氣候變化要承擔主要責任。ｂｅ　ｔｏ�。猓欤幔恚�應承擔責任，可知答案為ｂｌａｍｅ。

【7】句意：研究者收集了來自政府的數(shù)據(jù)。根據(jù)句意可知答案為government。

【8】句意：隨著一些科學家的辯論。此處是ｗｉｔｈ的獨立主格結構，答案為ｗｉｔｈ。

【9】句意：它以這些數(shù)據(jù)為基礎。此處the data是先行詞，后面是介詞+which引導的定語從句，可知答案為which。

【10】句意：它的基礎數(shù)據(jù)不全，沒有足夠的代表性為世界范圍的野生動物的下降產(chǎn)生一個單一的數(shù)量�？芍鸢笧�a。

【名手點睛】

1.Since自從---以來（可做介詞和連詞），和現(xiàn)在完成時態(tài)連用。

He has lived here since he came. 自從他來到這里，就一直在這里住著。

2.It is /has been+一段時間+since 主語+一般過去時態(tài)+其他。自從做某事有多長時間了。

在這個句型中如果從句的動作是終止性動詞，則表示從動作開始到現(xiàn)在多長時間了；如果從句的動作是持續(xù)性動詞，則表示從動作結束到現(xiàn)在多長時間了。It is three years since he joined (終止性動詞)the army.他參軍有三年了；It is five years since he lived（持續(xù)性動詞）here.他離開這有五年了。

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