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 are thought to produce chemicals with unusual odors（气味）．Researchers think dogs have the ability to smell these odors, 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 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．
49．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
50．According to the text, people who suffer bladder cancer_____
A．often have urine with unusual smell                       B．probably smoke cigarettes in their life
C．can easily make dogs lie down                    
D．are likely to die within nine years
51．The underlined word “involved” in the text is closest in meaning to _____．
A．showed            B．used          C．proved       D．preferred
52．What can we conclude from the last paragraph?
A．Dogs can only smell bladder cancer．
B．Dogs have a good knowledge of cancer．
C．Cancer doesn’t have any sign in the beginning．
D．Scientists might invent some equipment to test cancer．

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 are thought to produce chemicals with unusual odors（气味）．Researchers think dogs have the ability to smell these odors, 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 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．

49．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

50．According to the text, people who suffer bladder cancer_____

A．often have urine with unusual smell                       B．probably smoke cigarettes in their life

C．can easily make dogs lie down                    

D．are likely to die within nine years

51．The underlined word “involved” in the text is closest in meaning to _____．

A．showed            B．used          C．proved       D．preferred

52．What can we conclude from the last paragraph?

A．Dogs can only smell bladder cancer．

B．Dogs have a good knowledge of cancer．

C．Cancer doesn’t have any sign in the beginning．

D．Scientists might invent some equipment to test cancer．

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 are thought to produce chemicals with unusual odors（气味）．Researchers think dogs have the ability to smell these odors, 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 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．

49．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

50．According to the text, people who suffer bladder cancer_____

      A．often have urine with unusual smell                        B．probably smoke cigarettes in their life

      C．can easily make dogs lie down                     

       D．are likely to die within nine years

51．The underlined word “involved” in the text is closest in meaning to _____．

     A．showed             B．used           C．proved        D．preferred

52．What can we conclude from the last paragraph?

     A．Dogs can only smell bladder cancer．

     B．Dogs have a good knowledge of cancer．

     C．Cancer doesn’t have any sign in the beginning．

       D．Scientists might invent some equipment to test cancer．

Switzerland is famous for its watches. However, this country didn’t   26  the watch.   It was the British   27  did it. Here is a story of   28  the watch was   29  to Switzerland.   

Many years ago, an Englishman was    30   to Italy     31    his way he 

stopped in a small town in south Switzerland. This Englishman travelled in a      carriage inside    32   there was a carriage watch. This was the    33   kind of   watch. A native shop assistant    34    to see the watch. He    35   what it was   and asked the Englishman   36  it. “It is a carriage watch.  ”said the man. “ This  machine    37  the time but now it isn’t working.” 

At once the shop assistant    38   to try to repair it. So the traveller  39   him the watch. The assistant was a very wise man. So it  was not  40  that he managed to repair it. He  41   remembered how it was made. As soon as the traveller had   42  on his journey, he made a watch of    43  the same type. 

      44   the watch-making was    45   in Switzerland. Today Swiss watches are sold in stores all over the world. 

26.A.make        B.invent     C.produce      D.develop 

27.A.which       B.who       C.where        D.they 

28.A.why         B.that       C.how         D.when 

29.A.carried       B.sold      C.sailed        D.brought 

30.A.travelling     B.riding     C.walking      D.running 

31.A.On          B.In         C.At          D.From 

32.A.which       B.that        C.it           D.whom 

33.A.proper       B.smallest    C.earliest       D.biggest 

34.A.wanted      B.seemed     C.happened     D.discovered 

35.A.wondered    B.thought    C.understood    D.discovered 

36.A.on          B.about      C.of           D.with 

37.A.gives        B.tells       C.strikes       D.counts 

38.A.failed        B.helped     C.insisted      D.offered 

39.A.served       B.shared     C.showed       D.handed 

40.A.surprise      B.surprised   C.surprising     D.surprises 

41.A.however      B.besides    C.but          D.even 

42.A.gone        B.done       C.come        D.spent 

43.A.correctly     B.specially   C.exactly       D.naturally 

44.A.Thus        B.So         C.Otherwise    D.However 

45.A.opened      B.started      C.done         D.returned

Switzerland is famous for its watches. However, this country didn’t  26  the

watch.   It was the British   27  did it.Here is a story of  28  the

watch was  29  to Switzerland.

Many years ago, an Englishman was  30   to Italy   31   his way he stopped in a small town in south Switzerland. This Englishman travelled in a      carriage inside    32  there was a carriage watch. This was the  33  kind of  watch. A native shop assistant   34  to see the watch. He  35  what it was  and asked the Englishman   36  it.“Itis a carriage watch. ”said the man. “ This  machine    37  the time but now it

isn’t working.”

At once the shop assistant    38   to try to repair it. So the traveller  39  him the watch. The assistant was a very wise man. So it  was not  40  that he managed to repair it. He  41  remembered how it was made. As soon as the traveller had  42  on his journey, he made a watch of  43  the same type.

  44  the watch-making was   45  in Switzerland. Today Swiss watches are sold in stores all over the world.

1.                A．make          B．invent          C．produce  D．develop

2.                A．which          B．who           C．where    D．they

3.                A．why           B．that            C．how D．when

4.                A．carried         B．sold            C．sailed    D．brought

5.                A．travelling       B．riding          C．walking   D．running

6.                A．On            B．In             C．At   D．From

7.                A．which          B．that            C．it    D．whom

8.                A．proper         B．smallest         C．earliest   D．biggest

9.                A．wanted         B．seemed         C．happened D．discovered

10.               A．wondered      B．thought        C．understood D．discovered

11.               A．on            B．about          C．of    D．with

12.               A．gives          B．tells           C．strikes D．counts

13.               A．failed          B．helped         C．insisted   D．offered

14.               A．served         B．shared         C．showed   D．handed

15.               A．surprise        B．surprised       C．surprising  D．surprises

16.               A．however       B．besides         C．but   D．even

17.               A．gone          B．done          C．come D．spent

18.               A．correctly       B．specially        C．exactly    D．naturally

19.               A．Thus           B．So             C．Otherwise D．However

20.               A．opened        B．started         C．done D．returned