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
填空题
Where can you find the correct amount of the detergent to be used On ______.
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