时间长、范围广、闭合式的循环是(  )

时间长、范围广、闭合式的循环是(  )A.气相型循环 B.生物循环 C.沉积型循环 D.地球化学循环

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根据短文,回答题The main idea of this passage is to[ A ] describe a

根据短文,回答题The main idea of this passage is to[ A ] describe a woman who suffered f

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Why do people like to wear T-shirts so much today?

Why do people like to wear T-shirts so much today?A. T-shirts are suitable for h

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Questionsare based on the following dialogue between two fri

Questionsare based on the following dialogue between two friends talking about c

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与植物对矿物质离子的吸收有关的是(  )

与植物对矿物质离子的吸收有关的是(  )A.矿物质离子的浓度 B.温度、水、气体等环境条件 C.植物对矿物质离子的吸收能力 D.以上三个都正确

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