托福考试

【单选题】
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Listen to a part of a lecture in an ecology class.

What do hydrologists mainly studyA．The role of solar energy in the cycle.
B．Water movement and storage on lanD、
C．Biological reactions that use water.
D．The amount of water evaporated from the lanD、

网考网参考答案：B
网考网解析：
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