A. spell books
B. magic wands
C. Hogwarts robes
D. sports equipment
31. For what purpose is the text written?
A. To tell a magic story.
B. To announce a new plan.
C. To introduce a theme park.
D. To offer a flying program.
D
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 20 pounds 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 75 Pacific bottlenose dolphins, with natural biosonar (生物声纳) that tracks better than any manmade device; and 35 California 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.
【青海省西宁二十一中2017-2018学年高二上学期11月月考英语试卷】相关文章:
★ 青海省西宁二十一中2017-2018学年高二上学期12月月考英语试卷
★ 湖北省襄阳市致远中学2016-2017学年高一12月月考英语试题
★ 山西省应县一中2017-2018学年高二下学期第八次月考英语试卷
★ 湖北省武汉市部分重点中学2016-2017学年高一上学期期末考试 英语试题含听力 Word版含答案
★ 天津市宝坻区2016-2017学年高二11月联考英语试卷
★ 福建省福州八中2016-2017学年高一下学期期中考试英语试卷
★ 江西省南昌市五校2016-2017学年高二上学期第二次联考英语试卷
★ 河南省周口市2017-2018学年高二上学期第一次月考英语试卷
★ 河南省周口市2017-2018学年高一上学期第一次月考英语试卷
★ 江西省抚州市临川十中2017-2017学年高一上学期期中考试英语试题
最新
2019-11-15
2019-11-15
2019-11-14
2019-11-14
2019-11-11
2019-11-11