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　　Dogs are known for their sense of smell．They can find missing people and things like bombs and illegal drugs．Now a study suggests that the animal known as man's best friend can even find bladder(膀胱)cancer．

　　Cancer cells(细胞)are thought to produce chemicals with unusual smells．Researchers think dogs have the ability to smell these smells, even in very small amounts, in urine(尿)．The sense of smell in dogs is thousands of times better than in humans．

　　The study follows reports of cases where, for example, a dog showed great interest in a growth on the leg of its owner．The man was later found to be skin cancer．

　　Carolyn Willis led a team of researchers at Amersham Hospital in England．They trained different kinds of dogs for the experiment．The study involved urine collected from bladder cancer patients, from people with other diseases and from healthy people．

　　Each dog was tested 8 times．In each test there were 7 samples for the dogs to smell．The dog should signal the one from a bladder cancer patient by lying down next to it．Two cocker dogs were correct 56 percent of the time．But the scientists reported an average success rate of 41 percent．

　　The British Medical Journal published the research．In all, 36 bladder cancer patients and 108 other people took part．During training, all the dogs reportedly even identified(认出)a cancer in a person who had tested healthy before the study．Doctors found a growth on the person's right kidney(肾)．

　　Carolyn Willis says dogs could help scientists identify the combined(合成)chemicals produced by bladder cancer．That information could then be used to develop machines to test for the chemicals．The team also plans to use dogs to help identify markers for other kinds of cancer．

(1)

What's the general idea of the text?
[　　]
A．	Dogs have a good sense of smell
B．	Dogs can help cure cancer
C．	Dogs can smell cancer
D．	Dogs help perform experiments

(2)

According to the text, people who suffer bladder cancer ________．
[　　]
A．	often have urine with unusual smell
B．	probably like smoking in their life
C．	can easily make dogs lie down
D．	are likely to die within nine years

(3)

The underlined word“involved”in the text is closest in meaning to ________．
[　　]
A．	showed
B．	proved
C．	used
D．	preferred

(4)

What can we know from the last paragraph?
[　　]
A．	Dogs can only smell bladder cancer．
B．	Dogs have a good knowledge of cancer．
C．	Scientists might invent some machines to test cancer．
D．	Cancer doesn't have any sign in the beginning．

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阅读下面短文，从所给单词中选出适当的单词，并用其正确的语言形式填在标有题号的空白处。(每空一词)

exercise 　　 big　　　get　　when　　　child　　size　
inside　　　clear　　arrive　　outside　　what　　make

　　Dogs are very good pets. They are very friendly to people and very
beautiful , too. Most dogs get onwell with 1.___and their parents. Others are
good watch dogs becuase they cry loudly when a strange person 2.___.
　　When you buy a dog, an important thing to think about is its 3.___- buy a
small dog if your home is small and a 4.___one if yours is larger. Many people
don't know 5.___to feed their dogs with. Dogs eat almost anything! They like
meat, rice and lots of other things. You can buy lots of food which is 6.___for
dogs in shops. Don't let your dog eat too much. Always leave some 7.___water
your dog. It can 8.___thirsty very quickly, especially in summer.
　　Remember that dogs need 9.___.You should take it for a walk every day.
Don’t keep your dog 10.___all day.
1._________2._________3. _________4. _________5. _________
6. ________7. _________8. _________9. _________10. ________

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(exercise big get when child size　inside clear arrive outside what make)
　　Dogs are very good pets.They are very friendly to people and very beautiful,too.Most dogs get on well with_6_and their parents.Others are good watchdogs because they cry loudly when a strange person_7_

　　When you buy a dog,an important thing to think about is its_8_--buy a small dog if your home is small and a _9_one if your is larger.Many people don't know -10_to feed their dogs.Dogs eat almost anything!They like meat,rice and lots of other things.You can buy lots of food which is _11_for dogs in shops.Don't let your dog eat too much.Always leave some _12_water for your dog.It can _13_thirsty very quickly,especially in summer.

　　Remember that dogs need _14_.You should take it for a walk every day.Don't keep your dog _15_all day.

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狗太难照料了。

　　Dogs are too difficult _______ ______ ______ ______.

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看图完成答句，每空一词