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TF阅读真题第646篇The vadose Zone and its Structure

题目：新托福第006套20260201（02）真题（图片版）https://mp.weixin.qq.com/s/fnAvOjGSDm2wjmgqhZvPnw答案： 

Methane Hydrate as a Potential Fuel   At the bottom of the world's oceans lies a potential source of energy that could provide society with fuel well into the next century. Th...

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