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.
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阅读理解
It was a fine day in autumn.Some girls and boys were out with their teacher.They were going to a museum.On their way to a bridge,they suddenly heard a loud bark behind them.The teacher told her students to stop.Then she turned and listened.When she heard them cry,"Mad(疯的) dog!",she knew what was happening.Before she could do anything,she saw dog running to them."Children," said the teacher,"keep close to each other.Don't move or cry." At this moment the teacher saw a man.He ran up with a gun in his hand."I must keep the children safe until the man comes." thought the lady.
Then she stood before the children so that the dog would meet her first.The animal came quickly.The teacher pretended(假装) to pick up a stone to hit the mad dog.The dog stood there quietly for a few moments.The man came and killed the animal.The dog didn't bite the brave lady.When people heard of this,they said,"The lady was brave.We'll remember her forever."
根据短文内容选择正确答案。
(1)
When the teacher and her pupils crossed the bridge,they heard __________.
A.people running B.little boy
C.a great bark D.someone calling them
[ ]
(2)
The lady told her students __________ when the dog was running towards them.
A.to run away as fast as possible B.not to move or cry
C.to jump into the river D.to keep quiet
[ ]
(3)
The man came and killed the mad dog with __________.
A.a knife B.his gun C.a big stone D.a long stick
[ ]
(4)
People would never forget the lady because she __________.
A.killed the dog herself B.saved the lives of her students
C.was good at her teaching D.died soon after the doctors arrived