Each dog was tested eight times.In each test there were seven samples for the dogs to smell.The dog was supposed to signal the one from a bladder cancer patient by lying down next to it.
Two cocker spaniels(短腿长毛垂耳小猎犬)were correct fifty-six percent of the time.But the scientists reported an average success rate of forty-one percent.
As a group,the study found that the dogs chose the correct sample twenty-two out of fifyt-four times.That is almost three times more often than would be expected by chance alone.
The British Medical Journal published the research.In all,thirty-six bladder cancer patients and one hundred and eight other people took part.
During training,all the dogs reportedly even identified a cancer in a person who had tested healthy before the study.Doctors found a growth on the persons right kidney(肾).
Bladder cancer is the ninth most common cancer worldwide.The International Agency for Research on Cancer says this disease kills more than one hundred thousand people each year.Doctors say cigarette smoking is the leading cause of bladder cancer.
36.The experiment was conducted in a
A.private home.
B.training school.
C.hospital.
D.police station.
37.The dogs average success rate was
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