单项选择题

The pyramids were built ______.

A．before the Egyptians developed a sophisticated technology
B．after the Egyptians developed a sophisticated technology
C．to house the tombs of all ancient Egyptian kings and nobles
D．to keep mummies safe forever
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单项选择题
Usually waiters and waitresses expect their tip to be ______.
A．25% of the bill
B．15% of the bill
C．50% of the bill
D．20% of the bill
单项选择题
The general tone of the passage is one of ______.
A．annoyance
B．explanation
C．deduction
D．complaint
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