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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In the polar regions, the dog mainly （）

A．carried supplies
B．provided companionship
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Stop making so much noise, for you are ______ me in my studies.
A．attracting
B．disturbing
C．contracting
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