What is the main idea of the passage? Sharks eat their food by ______?

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问题 What is the main idea of the passage?
Sharks eat their food by ______?

选项 A、sucking
B、grinding
C、chewing
D、swallowing

答案D

解析 本题问“鲨鱼能过怎样的方式吃食物”。文中相关部分在第六段,其中提到“Most sharks do not chew their food,but swallow it down whole or in large pieces.”。也就是说,大多数鲨鱼并不用牙齿咀嚼或磨碎食物,而是将食物整个地或大块地吞下。故[D]“吞咽”正确。其他选项[A]“吮吸”、[B]“咀嚼”和[C]“磨碎”均与文意不符。
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