下列有关生物学常识的说法正确的是(  )。

下列有关生物学常识的说法正确的是(  )。 A.松鼠尾巴发挥着保暖、平衡身体的作用 B.萤火虫会发光是因为在它们的腹部末端有发光器 C.打呵欠是一种深呼吸动作,

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请在(75)处填上最佳答案。

请在(75)处填上最佳答案。A.water B.wet C.soak D.irrigate

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Efficient air service has been made available through modern

Efficient air service has been made available through modern technology.

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请在第(55)处填上最佳答案。

请在第(55)处填上最佳答案。

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Which of the following is the conclusion the author draws at

Which of the following is the conclusion the author draws at the end of the arti

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