单项选择题

The article does not say whether the scientists' experiments with dogs have （）

A．benefited animals other than dogs
B．served man
C．helped other dogs
D．contributed to medical knowledge

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单项选择题
The dog has been of most value to man m the development of（）

A．a treatment for rabies
B．open-heart surgery
C．a cure for distemper
D．all of the above
单项选择题
In the polar regions, the dog mainly （）

A．carried supplies
B．provided companionship
C．tracked prey
D．herded caribou(驯鹿)
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