单项选择题

A. A good idea.
B. No problem.
C. My pleasure.
D. Of course not.
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单项选择题
A personal alarm is designed for old people to ______.
A. detect safety conditions at home
B. avoid falls in the bathroom
C. send out signals for help
D. make phone calls easily
单项选择题
The car-renting rate remains $99 if you ______.
A. return the car to where you rent it
B. drive within the same city
C. buy the insurance
D. pay for the gas
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