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第1题

What happens when ice dams breaks?（4分） AThey may quickly block the river. BThe ice covering the river may melt fast.
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第2题

What happens when the large pieces of ice block the river?（4分） AIce begins to melt. BThey may cause the water to rise.
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第3题

When will deep snow lead to floods?（4分） AThe snow suddenly gets frozen. BThe top of the ground becomes wet. CIt rains
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第4题

What have scientists achieved in dealing with floods? （4分） AThey have prevented many rivers from flooding. B They
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