题目内容
【题目】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(脊椎动物)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】本文论述的是有关世界范围的野生动物下降的问题。
【1】根据since 1970自从１９７０年以来，可知句子用现在完成时态，population是句子主语，单数第三人称形式，故答案为has suffered。
【2】此处是分数的表达，四分之三，分子用基数词，分母用序数词的复数形式，故答案为fifths。
【3】句意：生活在湖、河和沼泽地的动物。此处是现在分词做后置定语，答案为ｌｉｖｉｎｇ。
【4】此处是副词修饰动词，答案为steadily。
【5】句意：人类知道变化的起因是什么。ｗｈａｔ引导宾语从从句，其双重作用。
【6】句意：人类活动和气候变化要承担主要责任。ｂｅ ｔｏ ｂｌａｍｅ应承担责任，可知答案为ｂｌａｍｅ。
【7】句意：研究者收集了来自政府的数据。根据句意可知答案为government。
【8】句意：随着一些科学家的辩论。此处是ｗｉｔｈ的独立主格结构，答案为ｗｉｔｈ。
【9】句意：它以这些数据为基础。此处the data是先行词，后面是介词+which引导的定语从句，可知答案为which。
【10】句意：它的基础数据不全，没有足够的代表性为世界范围的野生动物的下降产生一个单一的数量。可知答案为a。
【名手点睛】
1.Since自从---以来（可做介词和连词），和现在完成时态连用。
He has lived here since he came. 自从他来到这里，就一直在这里住着。
2.It is /has been+一段时间+since 主语+一般过去时态+其他。自从做某事有多长时间了。
在这个句型中如果从句的动作是终止性动词，则表示从动作开始到现在多长时间了；如果从句的动作是持续性动词，则表示从动作结束到现在多长时间了。It is three years since he joined (终止性动词)the army.他参军有三年了；It is five years since he lived（持续性动词）here.他离开这有五年了。
