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13.A.mark B.checked C.population D.destroyed E.chemicals

In Tanzania,an African country,a company called APOPO trains African pouched rats(非洲有袋鼠)to find landmines(地雷)left over from the wars.The rats are trained to smell out some of the (46)E  in them.More importantly,these rats are too light to set off the landmines.
Generally speaking,after 8to 12months of training,the rats can find landmines so that they can be safely destroyed.Rats and trainers search one small area at a time.To be sure that every inch of the ground is (47)B,APOPO workers use a harness-and-rope system that guides the rats back and forth in rows.The trainer stands safely on the edge(边缘) of the area.
When a rat smells landmines,it will dig the dirt in that spot(地点).The trainers (48)A each spot on a map.Later,people set off the landmines safely.
In the African country of Mozambique,nearly half of the (49)C are younger than 15years old.A lot of kids are in danger as they play and work.With the help of the rats and trainers,there will be no threat any more.

分析 文章大意:
在坦桑尼亚,一个非洲国家,一家名为APOPO的公司在训练非洲囊鼠寻找战争留下的地雷.
小鼠被训练,可以特异性的闻到地雷里面存在的特殊的化合物,因此可以通过小鼠的反应来推测有没有地雷.
这有两点好处,一方面可以训练小鼠快速准确的预知地雷的位置,另一方面可以避免使用人力,减小伤亡.

解答 46.E,考察名词辨析及上下文理解,句子的意思为"这些老鼠被训练成闻出地雷中的…味",而且在定冠词the后面肯定跟一个名词.根据所提供的两个名词,本题答案为chemicals(化学药品).因此选择E.
47.B,考察动词辨析及上写文理解,句子的意思为"确保每一寸土地…",可能填"形容词"或"被动语态",根据前句意思"老鼠和工作人员搜寻更小的区域",所以本题答案为checkecd(被检查).因此选择B.
48.A,考察名词辨析及上下文理解,句子的意思为"当老鼠闻出地雷后,挖出.然后工作人员对于这个地点在地图上进行…",根据意思应该填一个动词,根据前句和后句的时态,应为"一般现在时",所以本题答案为mark(标记).因此填写A.
49.C,考察名词辨析及上下文理解,句子的意思为"将近一般的…都小于15岁",根据意思肯定填一个名词,那么就是"一般的人(口)",所以本题答案为population(人口).因此选择C.

点评 本题题型为选词填空.在选择给定词语时,再考虑文章大意的前提下,还应该注意文章及句子所用的时态,以及所填写的词在句子中的位置.通过这些判断,适当改变词汇形式,以符合题目要求.

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