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Energy Crisis
One of the main......

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单项选择题
The author's purpose in writing this passage is to______.
A．explain how Kitty Litter is produced
B．describe the Mine Safety and Health Administration
C．show how tidy cats are
D．show that the government can sometimes be a nuisance
单项选择题
The clay excavation is______.
A．half a mile underground
B．several miles from Pads, Tennessee
C．worked by miners in shafts several hundred feet down
D．not far from the Kitty Litter plant
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