题干

读下面一则材料,仔细思考,把你的发现写下来。

       有位动物学家在对生活在非洲奥兰沿河两岸的动物进行考察中,发现了一个奇怪的现象:生活在河东岸的羚羊繁殖能力比西岸的强,并且奔跑能力也不一样,东岸的羚羊奔跑速度每分钟要比西岸的羚羊快13米。

       对这些差别,动物学家百思不得其解,因为除了东岸有狼群活动以外,其它的生活环境和食物都相同。在这位动物学家的倡仪下,动物保护协会做了一个实验,在河东西岸各捉了10只羚羊送到对岸,结果,送到西岸的羚羊繁殖到了14只,而送到东岸的只剩下了3只,动物学家发现,另外7只都被狼吃掉了。

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答案(点此获取答案解析)

东岸的羚羊之所以强健,是因为它们的附近生活着狼群,它们为了生存,天天生活在一种“竞争气氛”中,反而越来越强健,而西岸的羚羊之所以弱小,是因为它们缺少天敌,没有生存压力。

同类题2

    We use the Internet for many things: business, shopping, writing letters, talking to people, finding information, and so on. In recent years, a new kind of English has grown on the Internet. There's no real word for it yet, so we'll call it e-talk. People don't like typing too much. To save time, they turn phrases (短语) into a few letters called acronyms(首字母缩略词). Acronyms are often used in chat rooms.
Some of them are:
BTW(by the way)     BRB (be right back)
LOL (laughing out loud) IMO (in my opinion)
People also use many abbreviations. They are shortened forms of words. Some common abbreviations are:
info (information)    puter (computer)    pic (picture)      sec (second)
We usually don’t see people when we communicate on the Net, so people have new ways to show feelings. Most people use their keyboards to draw “feeling”, such as:
: ) (happy)     :-( (sad) ;    : P (joking)   : O (surprised)
These days, many forums have picture feelings. For example:
happy          sad         angry        cool
There are even whole new words, like ‘newbie’ (someone who is new on a chat board or forum). When you write something bad about someone else, it’s called ‘flaming’ the person.
It takes time to get used to e-talk. Also, different groups in the Net have their own special ways of communicating. Newbies sometimes have to ask other people what they mean. As the Internet grows, e-talk will continue to grow and change.