题目内容
12．Although these kinds of trainers are new models，they______ well．（ ）| A． | don't sell | B． | aren't sold | ||
| C． | won't be sold | D． | were not selling |
分析 虽然这些运动鞋是新款式，但是卖的不好．
解答 答案：A．表达的是客观事实用一般现在时，sell是主动形式表示被动意义，主语they，借助于do构成否定，后加原形，故答案是A．
点评 Sell是主动形式表示被动意义，有类似用法的动词还有：wash，clean，cook，iron，look，cut，sell，read，wear，feel，draw，write，sell，drive…
如：The book sells well．这本书销路好．
This knife cuts easily．这刀子很好用．
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17．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．
Of the 90million 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 of small animals such as rabbits and field mice．
They can also bring illness to the animals that live in people's yard（院子），further weakening the health of the natural populations．
Allowing pet cats to go outside is not just bad for birds and wildlife，it's also bad for the cats themselves．Outdoor cats can get sick very easily．They are in danger from traffic and attacks（攻击）from other animals．In fact，outdoor cats usually don't live past the age of five，while indoor cats often live to be 17or older．
Keep your pet cat inside!If you raise a young cat，it's your duty to let it play inside．
Of the 90million 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 of small animals such as rabbits and field mice．
They can also bring illness to the animals that live in people's yard（院子），further weakening the health of the natural populations．
Allowing pet cats to go outside is not just bad for birds and wildlife，it's also bad for the cats themselves．Outdoor cats can get sick very easily．They are in danger from traffic and attacks（攻击）from other animals．In fact，outdoor cats usually don't live past the age of five，while indoor cats often live to be 17or older．
Keep your pet cat inside!If you raise a young cat，it's your duty to let it play inside．
| Problem | The number of birds is becoming （91）smaller； at the same time，many pet cats are in （92）dangerfrom traffic and attacks from other animals． |
| Reason for the problem | Pet cats are （93）allowedto go outside freely． |
| What to do | People who （94）raisea young cat have the （95）duty to let it play inside． |