Question

7．46．Many kinds of birds live in the United States，but the number of the birds is becoming smaller every year．One of the leading reasons is the growing number of pet cats．By keeping your pet cats in your home，you can help give birds a better possible chance to live．D
47．Of the 90 million pet cats in this country，about two-thirds are allowed to go outside．It is said that these cats kill hundreds of millions of birds each year，as well as billions os small animals such as rabbits and field mice．F
 48．They can also bring illness to the animals that live in people's yard（院子），and further weakening （变弱） the health of the natural populations．E
 49．Allowing pet cats to go outside is not just bad for birds and wildlife（野生动物），it is bad for the cats themselves，too．Outdoor cats can get sick very easily．They may be in danger from traffic and attacks （攻击）from other animals．In fact，outdoor cats usually don't pass the age of five，while indoor cats often live to be 17 or older．B
 50．Keep your pet cat inside!If you raise a young cat，it's your duty to let it play inside．A

A．You should let your cat inside．
B．Going outside is bad for cats，too．
C．Keeping a cat is good for you．
D．The birds are fewer and fewer in America．
E．Cats can bring illness．
F．Cats kill many birds and small animals every year．

Answer 1

分析 给段落内容选标题的题目．
46．在美国鸟的数量每年都在减少，是由于宠物猫的数量增加，通过把你的宠物猫留在家里，可以给鸟一个生存的机会．
47．在这个城市的9亿宠物猫中，有三分之二的被允许外出，据说这些猫每年杀害了数以十万计的鸟和小动物，如兔子和田鼠．
48．他们也能把疾病带给其它的在人类的院子里的动物．进一步削弱了健康在自然种群．
49．让宠物猫出去不只是坏的后院鸟类和野生动物；这也是坏的猫．室外猫可以很容易生病．他们交通的危险，毒药，和其他动物的攻击．事实上，室外猫通常不会活过五岁，而室内猫经常活到17岁．
50．保持你的宠物猫在室内．如果你养一只小猫，让它在室内玩耍是你的职责．

解答 46-50 DFEBA
46．D；根据Many kinds of birds live in the United States，but the number of the birds is becoming smaller every year．可知，许多居住在美国的鸟，数量每年变得越来越少，故选标题D；
47．F；根据It is said that these cats kill hundreds of millions of birds each year，as well as billions os small animals such as rabbits and field mice据说这些猫杀死了很多鸟和像小兔子，田鼠等小动物，故标题选F．
48．E；根据They can also bring illness to the animals that live in people's yard（院子），他们也能把疾病带给其它的在人类的院子里的动物，故标题选E．
49．B；根据Allowing pet cats to go outside is not just bad for birds and wildlife（野生动物），it is bad for the cats themselves，too．猫出去对自己也不好，故标题选B．
50．A；根据Keep your pet cat inside!保持你的宠物猫待在室内，故标题选A．

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