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What is the main idea of the passage? Why may the bull sharks attack people frequently?

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问题 What is the main idea of the passage?
Why may the bull sharks attack people frequently?
选项 A、Because they swims in shallow waters where people swim.
B、Because they may wildly attack anything in the sea.
C、Because human being is their favorite food.
D、Because they are very aggressive sharks.
答案A
解析 本题问“为什么牛鲨全频繁袭击人类”。文中相关部分在第十段，其中提到“The bull shark is the most frequent attacker of people as it swims in very shallow waters where people swim and is a very plentiful shark.(牛鲨袭击人类最频繁，因为它们常在人们游泳的浅水水域中出没，而且它们的数量众多。)”故[A]“因为它们全在人们游泳的浅水处出没”正确。[B]“因为它们有可能疯狂地攻击海中的任何事物”文中提到一群鲨鱼会偶尔以疯狂的方式进攻食物源，但这并不是牛鲨经常袭击人类的原因。[C]“因为人类是它们最为喜爱的食物”文中提到海豹和海狮是鲨鱼最喜爱的食物，而不是人类。[D]“因为它们属于非常好斗的鲨鱼类”文中没有提及相关内容。
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