19.In a little-known part of the counter-terrorism (反恐怖主义) world,one of the most effective detection systems is a 600-pound animal that works for about 20pounds of fish a day.
Since the 1960s,the United States and a handful of other countries have trained dolphins and sea lions to detect sea mines and swimmers,and to recover worn--out torpedoes (鱼雷) and testing objects used in naval (海军的) exercises.
The U.S.Navy kept its Marine Mammal Program a secret until the 1990s,and this spring CNN became one of the first members of the media to witness firsthand how the program works.
The program trains about 75Pacific bottlenose dolphins,with natural biosonar (生物声纳) that tracks better than any manmade device; and 35California sea lions,with very good underwater eyesight.
Not only do these trained marine mammals track and save millions of dollars in U.S.military equipment,they are also helping to save lives.The Navy won't reveal whether the dolphins and sea lions have effectively stopped terrorists attempting to do harm to the U.S.
A key part of the training program is teaching these mammals how to stop potentially unfriendly swimmers.The program is also positioned to defend against swimmer terrorist attacks as well.
In the digital age,it seems that there should be more advanced approaches to guard the Navy's most expensive things.But according to Rothe,the program director,nothing in today's high-technology world can compete with these mammals'biosonar abilities."I hope that one day there is a robot or a UUV (un-manned underwater vehicle) that makes the mammal program out of date,"he said."But right now this is the best thing out there."
25.The U.S.Marine Mammal Program trained marine mammals toA.
A.stop dangerous swimmers
B.catch 20pounds of fish a day
C.destroy sea mines
D.fire torpedoes
26.What can we learn from the last paragraph?A
A.The trained dolphins are the best way of protection available to the U.S.Navy.
B.There will be dolphin-like robots in the future according to Rothe.
C.The mammal program will become useless soon.
D.Rothe has no faith in today's high technology.
27.Which of the following is TRUE according to the text?D
A.Many countries have trained sea animals for counter-terrorism.
B.The Marine Mammal Program was a secret until the 1960s.
C.The trained sea animals have already stopped some terrorists.
D.The U.S.Navy has trained both dolphins and sea lions.
分析 可爱乖巧的海豚和海狮充当高效反恐先锋,成为美国反恐大军中的佼佼者.它们不仅可为美国海军减少巨额损失,同时还能帮助救赎生命.
解答 25.A 26.A 27.D
25.A 细节理解题.根据文章第二段及第六段中的teaching these mammals how to stop potentially unfriendly swimmers可以训练这些动物是为了阻止那些危险的游泳者,故A项正确.
26.A 推理判断题.根据最后一段…nothing in today's high-technology world can compete with these mammals'biosonar abilities可知,在某种意义上讲,海豚是保护美国海军最好的方法,故答案为A
27.D 细节理解题 根据第三段The program trains about 75Pacific bottlenose dolphins,with natural biosonar (生物声纳) that tracks better than any manmade device; and 35California sea lions,with very good underwater eyesight.可知,这项项目不光训练海豚,还训练了海狮,可知D项是正确的,故答案为D
点评 阅读理解题测试考生在阅读基础上的逻辑推理能力,要求考生根据文章所述事件的逻辑关系,对未说明的趋势或结局作出合理的推断;或根据作者所阐述的观点理论,对文章未涉及的现象、事例给以解释.考生首先要仔细阅读短文,完整了解信息,准确把握作者观点.