1．阅读下面的短文，并完成短文后的任务．
Have you ever wondered why birds sing？Maybe you thought that they were just happy．After all，you probably also sing or whistle when you are happy．
Some scientists believe that birds do sing some of the time just because they are happy．However，they sing most of the time for a very different reason．Their singing is actually a warning to other birds to stay out of their territory．
Do you know what a"territory"is？A territory is an area that an animal，usually the male，claims（宣称）as its own．Only he and his family are welcome there．No other families of the same species（物种）are welcome．Your yard and house are your territory where only your family and friends are welcome．（76） If a stranger should enter your territory andwant to hurt you，you might shout．Probably this would be enough to frightenhim away．
If so，you have actually frightened the stranger away without having to fight him．（78）一只鸟也将会做同样的事．But he expects an outsider almost any time，especially at nesting （筑巢）season．So he is screaming（尖叫）all the time，whether he can see an outsider or not．This screaming is what we call a bird's song，and it is usually enough to keep an outsider away．
Birds sing loudest in spring when they are trying to attract a mate（同伴）and warn others not to enter the territory of theirs．
You can see that birds have a language of their own．Most of it has to do with attracting mates and setting up territories．
76．根据 （76）处划线部分的意思来完成下面句子．（每空一词，共2词）
You might frighten a stranger away byshouting at him if he should enter your territory and want to hurt you．
77．根据文章，给下列问题选择最佳选项．
What is a bird's"territory"？D
A．A place where other families of the same species are welcome．
B．A place where a bird can sing loudly．
C．An area where birds often fight against each other．
D．An area which a bird considers to be its own．
78．将 （78）处划线句子翻译成英语．A bird does the same thing．
79．从文中找出一个与"establish"同义的短语，并填在横线上setting up．
80．用一句话概括本文的中心大意（不超过10个单词）．Birds warn others not to enter their territory by singing．
分析 文章大意：
文章主要讲的是鸟的一种生活习惯，那就是通过鸣叫（唱歌）来建立并捍卫自己的领地，避免同类鸟儿进入自己的领地，同时鸟儿唱歌还有一个作用就是吸引异性．
解答 76．shouting at，推理判断题，文中提到"If a stranger should enter your territory and want to hurt you，you might shout"当一个陌生人闯进你的领地，你或许会大喊，由此确定应该是向他大喊，shout at译为对…大喊，由于前面出现介词by，所以填写动名词形式表示方式，填写"shouting at"．
77．D，词义猜测题，文中提到"A territory is an area that an animal，usually the male，claims（宣称）as its own"领地的意思是一个动物，通常是雄性动物，宣称的那片仅属于它自己的地方，由此确定选择D．
78．A bird does the same thing，考察英汉互译，分析句子结构，主语是一只小鸟，用不定冠词a，在开头首字母大写，所以为A bird，动作主体为做同样的事，所以用动词do来表示，相同的事情是same thing，且由于主语是a bird，所以动词用第三人称单数，因此填写"A bird does the same thing"．
79．set up，词义推断题，establish译为建立，安置，在文章最后一句中提到"Most of it has to do with attracting mates and setting up territories"大多数的鸟靠唱歌来吸引异性，同时建立领地，由此确定词组为set up．
80．Birds warn others not to enter their territory by singing，主旨大意题，文中从一开始就在说明鸟儿为什么唱歌，那是在建立并捍卫自己的领地，由此确定填写"Birds warn others not to enter their territory by singing"
点评 对于阅读表达题，一定要记得首先通读全文，了解文章大意，然后再根据文章关键词，关键句，掌握细节问题，并进行推理判断，再去回答具体的问题．
