单项选择题

According to the professor, why is the buffalo population increasing

A．More buffalo are surviving the winter.
B．Fewer buffalo are dying of disease.
C．More buffalo are being born.
D．Fewer buffalo are being killed by hunters.

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Why didn't the woman go swimming

A．She doesn't know how to swim.
B．The water was too deep.
C．The water was too cold.
D．She didn't have enough tim

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Why did the woman have to stop playing in the volleyball game

A．She had to go home.
B．She was too tired to continue.
C．She had to finish her schoolwork.
D．She was thirsty.