第23空正确答案是(  )

第23空正确答案是(  )

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What would be the best title for the passage?

What would be the best title for the passage?

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We believe ________ you have devoted yourself to is sure to

We believe ________ you have devoted yourself to is sure to come true.

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请在53处填写答案。(  )

请在53处填写答案。(  )

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一杯盐水,加盐20克后浓度变为25%,然后蒸发掉20克水,浓度变为30%。然后加盐20克,问此时这杯盐水的浓度是多少?

一杯盐水,加盐20克后浓度变为25%,然后蒸发掉20克水,浓度变为30%。然后加盐20克,问此时这杯盐水的浓度是多少?

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