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.

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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

单项选择题

What is the meaning of to a man in Line 4, Paragraph 2

A．A man.
B．Every person.
C．As far as a man is concerned.
D．To a human being.