1.Scientists in Colombia have trained a team of rats to help remove land mines from the countryside.Land mines are small bombs(炸彈) hidden in the ground and designed to explode(爆炸) when someone steps on them.
When trained,the rats can smell special metals in the mines and then signal(發(fā)信號) to their human team.Then why use rats for such an important job?
In the past,dogs have been used to find bombs.Rats have a good sense of smell and can respond to orders,just like dogs do.But rats are much lighter than dogs.They stand less of a chance of setting off the mines,which explode under a certain amount of weight.What's more,the best rats are cheaper to keep than dogs.It costs about the same amount of money to take care of one dog as it does 70rats.
The rats have already been used in Tanzania,an African country with many land mines.Luisa Fernanda Méndez and her team in Colombia are training the even lighter Wistar rats.These are the white rats with red eyes that scientists often use in laboratory experiments."They even train their babies to perform their jobs,which saves us a lot of time,"Méndez said.
Colombia has the second-highest rate(比率) of deaths from land mine accidents in the world.Last year,land mines killed 695people-56of whom were children.A criminal(犯罪的)group called the Revolutionary Armed Forces of Colombia,or FARC,as well as other organizations,have placed the mines.FARC are strongly against Colombia's government.The group has placed mines all around its own bases and in many places in the countryside.
In the past,the Colombian government hired peasants and poor farmers to find mines.Many of them died trying to find the well-hidden bombs.
Colombian police official Erick Guzmán hopes the team of rats can come to the rescue(援救)."These rats will be a great help,"he said.
32.How do rats help to find land mines?C
A.By their special sight.
B.By their light weight.
C.By their sense of smell.
D.By their excellent hearing.
33.The advantage of rats over dogs in finding bombs is thatD.
A.they are cleverer.
B.they run faster
C.they have a better sense of smell
D.they don't make mines explode as easily
34.The underlined word"They"may refer toB.
A.scientists
B.Wistar rats
C.dogs
D.Méndez and her team
35.What is the passage mainly about?A
A.Specially-trained rats help clear land mines.
B.People in Tanzania are suffering from land mines.
C.Dogs are no longer used to find land mines.
D.Land mines have become a great danger to Colombians.
分析 本文敘述了科學家們在哥倫比亞已經(jīng)訓練一組老鼠幫助在農(nóng)村清除地雷.以前用狗來幫助清除地雷,老鼠的優(yōu)勢他有靈敏的嗅覺,能夠聞出特殊的金屬味,并且他們的體重輕引爆地雷的可能性小,還有養(yǎng)它們的費用比養(yǎng)狗的費用低.
解答 CDBA
32 C 細節(jié)理解題.根據(jù)the rats can smell special metals in the mines and then signal(發(fā)信號) to their human team.老鼠可以聞到特殊的金屬在煤礦,然后給人發(fā)信號,故選C.
33 D 細節(jié)理解題.根據(jù)But rats are much lighter than dogs.They stand less of a chance of setting off the mines,但是老鼠比狗更輕.他們的體重輕引爆地雷的可能性小,故選D.
34 B 詞義猜測題.根據(jù)The rats have already been used in Tanzania,an African country with many land mines.Luisa Fernanda Méndez and her team in Colombia are training the even lighter Wistar rats.These are the white rats with red eyes that scientists often use in laboratory experiments.上文提到的是Wistar rats,故選B.
35 A 主旨大意題.根據(jù)全文的內(nèi)容主要說的是受過特殊訓練老鼠幫助清理地雷,故選A.
點評 做閱讀理解時要快速的瀏覽全文,把握文章主旨大意,帶著問題回到原文,尋找細節(jié)或概括相應的答案,最后要理清作者寫作思路.