题目内容

In the U.S., the world’s largest body of freshwater, the Ogallala Aquifer, an underground lake that extends from the Colorado Rockies to South Dakota going all the way down to the Texas Panhandle with a range of ____ feet of depth. This water resource is what has made America’s plains the “_” of the world. Unfortunately, like an oil well, this won’t last ____. The Ogallala used to have an average depth of 240 feet. Today its average depth is just 80 feet.

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