Question

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_小题1:__  in them. More importantly, these rats are too light to set off the landmines.
Generally speaking, after 8 to 12 months 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 _小题2:_, 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 __小题3:_ each spot on a map. Later, people set off the landmines safely.
In the African country of Mozambique, nearly half of the ___小题4:__ are younger than 15 years 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.

Answer 1

小题1:E
小题2:B
小题3:A
小题4:C

试题分析：短文大意：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。
小题1: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)。
小题2: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)。
小题3: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)。
小题4: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)。