题目内容：
What would be the best title for the passage?
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
单选题：What would be the best title for the passage?
- 题目分类：英语
- 题目类型：单选题
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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.
请在53处填写答案。（ ）
请在53处填写答案。（ ）
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?
请在（78）处填上最佳答案。
请在（78）处填上最佳答案。
Only when you have obtained enough data _____________ come t
Only when you have obtained enough data _____________ come to a sound conclusion