单选题
Which of the following is mentioned by the author as a reason why the baleen whale population has been reduced?
A、
Increased pollution of the seas.
B、
Hunting.
C、
Insufficient supply of food.
D、
Disease.
【正确答案】
B
【答案解析】
文章第二段中“Though reduced by hunting…”一句告诉我们此种鲸变少的原因在于捕杀，因此选B。
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