单项选择题

Scientists everywhere are trying to ______ a cure for AIDS.

A．expect
B．invent
C．discover
D．make
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单项选择题
After a meal in a restaurant, you should ask the waiter for the ______.
A．bill
B．note
C．receipt
D．menu
单项选择题
The book is different ______ all the other books I have ever read.
A．from
B．of
C．to
D．in
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