题目内容
The speaker is talking about the coming global ________ problem.
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Water is the key component in our daily life, not only for human use, but for energy, industry, ______________and livestock.
If you look at the earth, you will notice that over 75 % of our blue planet is water. But the problem is only 3% of that water is ________water.
What once was a booming town that relied on the Ogallala Aquifer, has now seen its depths of underground water ____ between 0-50 feet. Many wells are completely ______ and farmers have been forced to hand over their ______ to the government’s Conservation Reserve Program (CRP) in exchange for grants.
在幻灯片母板中插入的对象，只能在()中可以修改
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