单项选择题

What color are the shuttle bus signs

A．Yellow and red.
B．Dark yellow.
C．Light yellow.
D．Bright yellow.
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单项选择题
Most complaints take _____ to investigate.
A．two weeks
B．less than two weeks
C．two to three weeks
D．more than three weeks
单项选择题
There are more complaints about_____ than others.
A．clothing
B．electrical appliances
C．travel agencies
D．photographic equipment
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