2. 外语
  3. What is the main idea of the passage? Different from most fishes, shark’s body is not upheld by ______.

What is the main idea of the passage? Different from most fishes, shark’s body is not upheld by ______.

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问题 What is the main idea of the passage?
Different from most fishes, shark’s body is not upheld by ______.
选项 A、fiber
B、bones
C、cartilage
D、skeleton
答案C
解析 本题问“与大多数的鱼类不同，鲨鱼的身体不是由什么支撑”。文中第二段提到“Unlike bony fish，sharks have no bones；their skeleton is made of cartilage (软骨)，which is a tough，fibrous(纤维性质的)substance，not nearly as hard as bone.”也就是说，与多骨鱼类不同，鲨鱼没有骨头，它们的骨骼是由坚韧、纤维性质的软骨构成，不像骨头那样硬。故[C]“骨头”正确。[A]“纤维”指的是鲨鱼软骨的性质。 [B]“软骨”和[D]“骨泉”由第二段可知，鲨鱼的身体是由软骨构成的骨架支撑的。
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