题目内容
11．Orcas，or killer whales，are the largest of the dolphins and one of the world's most powerful animals feeding on meat．They feast on marine mammals such as seals，sea lions，and even whales，employing teeth that can be four inches （ten centimeters） long．They are known to grab seals right off the ice．They also eat fish，squid （鱿鱼），and seabirds．Though they often frequent cold，coastal waters，orcas can be found from the polar regions to the Equator （赤道）．
Killer whales hunt in deadly groups，family groups of up to 40 individuals．There appear to be both permanent and temporary group populations of killer whales．These different groups may hunt different animals and use different techniques to catch them．Permanent groups tend to prefer fish，while temporary groups target marine mammals．All groups use effective，cooperative hunting techniques that some are similar to the behavior of wolf packs．
Whales make a wide variety of communicative sounds，and each group has various noises that its members will recognize even at a distance．They use echolocation （回波定位） to communicate and hunt，making sounds that travel underwater until they meet objects，then reflect back，showing their location，size，and shape．
Killer whales are protective of their young，and other adolescent females often assist the mother in caring for them．Mothers give birth every three to ten years，after a 17-month pregnancy．
Killer whales are immediately recognizable by their special black-and-white coloring and are the intelligent，trainable stars of many aquarium shows．Killer whales have never been widely hunted by humans．
37．Killer Whales do not feed onD．
A．seabirds B．seals C．fishes D．seaweeds
38．The following aspects about killers whales are mentioned exceptC．
A．hunting B．communication C．weight D．habitats
39．We can conclude thatC．
A．people can find killer whales everywhere around the world
B．killer whales live in different groups and never live alone
C．by making sounds killer whales hunt and communicate
D．humans'hunt has made killer whales being endangered
40．Killer Whale are often seen in some aquarium shows becauseA．
A．they are able to be trained
B．they have special body colors
C．they must be protected
D．they have never been hunted．
分析 本文主要讲述了一种肉食性动物虎鲸的捕食习性、交流方式和栖息地等，因此其聪明，还可被驯化为人类表演节目．
解答 37．D 细节题．根据第一段Orcas，or killer whales，are the largest of the dolphins and one of the world's most powerful animals feeding on meat，以及They also eat fish，squid （鱿鱼），and seabirds．
可知，虎鲸是肉食性动物，不会吃海草．故选D
38．C 细节题．根据文章内容，Orcas，or killer whales，are the largest of the dolphins and one of the world's most powerful animals feeding on meat..They use en （回波定位） to communicate and hunt…Though they often frequent cold，coastal waters，orcas can be found from the polar regions to the Equator （赤道）．，文章分别讲述虎鲸的捕食习性、交流方式和栖息地．没有提到C选项的内容，故选C
39．C 细节题．根据倒数第三段They use en （回波定位） to communicate and hunt可知，虎鲸会使用声波来交流和捕食．
40．A 细节题．根据最后一段Killer whales are immediately recognizable by their special black-and-white coloring and are the intelligent，trainable stars of many aquarium shows可知，虎鲸经常出现在水族馆的表演中是因为它们非常聪明，可以被训练．
点评 本文是一个新闻报道类阅读，题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
