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

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.

单项选择题

What docs the author mean by the last sentence of the passage

A．Cats sometimes seem to be amused by human antics.
B．People sometimes appear to be laughing at the antics of cats.
C．Some people think cats are laughing at the Kitty Litter Plant.
D．Some people think cats are laughing at the futility of fire fighting procedures.