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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单项选择题

What is the meaning of manhours” in Line 2, Paragraph 2

A．The time needed in finishing the work by one man.
B．The work done by one man in one hour.
C．The man needed in finishing the work in one hour.
D．The work done by one man.

单项选择题

Has the company devised an escape system and fire fighting procedures so far

A．Yes, the company has done so because it is an order.
B．Of course, the company has done so although it is reluctant.
C．No, the company has not yet done it.
D．We could not judge from the passage.