A mussel grips a hard surface very firmly to The waterproof super glue originates in ______

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问题 A mussel grips a hard surface very firmly to
The waterproof super glue originates in ______

选项 A、the mussel’s tongue-shaped foot
B、the channel of the mussel’s foot
C、the thread given off by the mussel
D、some glands in the mussel’s body

答案D

解析 第二段第六句指出Special glands give off a fluid mixture。
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