问题

对下列加点字的意义和用法，解释正确的一项是（）①蚓无爪牙之利，筋骨之强 ②未之有也③奚以之九万里而南为 ④青，取之于蓝

A: ①②用法相同，但意义不同
B: ①②用法不同，意义也不同
C: ③④用法相同，意义也相同
D: ③④用法不同，但意义相同

正确答案是：

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