单项选择题

A．Secretary and Boss.
B．Teacher and Student
C．Customer and Librarian.
D．Customer and Salesman;
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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
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
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