Unique (among) bivalves, scallops swim extremely (well), propelled by jets of water expelled while (snapped) the shell (shut).

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问题 Unique (among) bivalves, scallops swim extremely (well), propelled by jets of water expelled while (snapped) the shell (shut).

选项 A、among
B、well
C、snapped
D、shut

答案C

解析
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