A mussel grips a hard surface very firmly to To tie itself safely to a new home, a mussel must ______

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问题 A mussel grips a hard surface very firmly to
To tie itself safely to a new home, a mussel must ______

选项 A、produce a thread to anchor to the hard surface
B、place many anchor lines strategically
C、hold down a tent as human beings do
D、draw air and water from its pad-like structure

答案B

解析 第二:段第九句讲到“These strategically placed threads form a bundle,which ties the mussel to its new home.”。
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