A dog has up to 300 million scent glands (嗅腺) (a human has about 5 million), which makes a dog's sense of smell up to 100,000 times more sensitive than people's.
“We believe all diseases have smell associated with the diseases, due to the changes occurring within the body, with different organs expressing different chemical compounds,” Ralph Hendrix, executive director of Dogs4Diabetics, told Medical News Today, “These smells are evident in breath and sweat.”
1.What does the passage mainly talk about?
A.Trained dogs are very clever.
B.Trained dogs can find out diseases like cancer, diabetes and so on.
C.Dogs that are trained have a good sense of smell.
D.Dogs that are trained can follow the rules.
2.What can trained dogs do for diabetics?
A.They can remind diabetics when their blood sugar levels are too low.
B.They can help diabetics find doctors when their blood sugar levels are too low.
C.They can warn diabetics to take medicine when their blood sugar levels are too low.
D.They can take diabetics some food when their blood sugar levels are too low.
3.What does the fourth paragraph mainly want to say?
A.The accuracy rate of trained dogs detecting the cancer is high.
B.The accuracy rate of trained dogs detecting the cancer varies widely.
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