单项选择题

The article does not mention 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
They stopped the car on top of a hill in order to ______.
A．see the spires and the domes
B．see Oxford
C．to park their car
D．to see the colleges
单项选择题
The dog has been of most value to man in the development of ______.
A．a treatment for rabies
B．open-heart surgery
C．a cure for distemper
D．Both A and C
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