问题
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Why does the shark never stop moving?A.It never sleeps.B.It can only smell when moving.C.I
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If segments appear in the same position but the mutual substitution does not change t
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What does the author mainly talk about in the passage?A.Supporting a position.B.Describing
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Which of the following does not fit with sleep hy
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When does the sleeping position best show your se
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What does the root “posit” mean?A.To place to pu