As coal mines became deeper, the problems of draining water, bringing in fresh air, and ________to the surface increased.
Câu hỏi
Nhận biếtAs coal mines became deeper, the problems of draining water, bringing in fresh air, and ________to the surface increased.
Đáp án đúng: D
Lời giải của Luyện Tập 365
Câu hỏi liên quan
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The phrase "keeps sellers on their toes" in the passage mostly means "______".
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The boat was sailing north when a terrible storm_____________ .
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Tom: "___________________ "
Mike: "I won't say no!" -
The examination was not very difficult, but it was_____________________ long.
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______ his brother, Mike is active and friendly.
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He_______________us but he was short of money at the time.
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__________ John Kennedy was elected president, he was the youngest American President ever.
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Stephanie: "Oh, no! I left my book at home. Can I share yours?"
Scott: "______ " -
Regular exercise and good diet will bring______fitness and health.
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_______ has been a topic of continual geological research.