单项选择题

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单项选择题
What is the purpose of this notice
A. To inform residents of water
conservation measures
B. To warn residents of weather conditions
C. To announce water pollution levels
D. To promote mineral water sales
单项选择题
What do business travelers have to provide
A. A receipt from their travel agent
B. A vaccination certificate
C. An additional photo
D. A letter from their employer
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