单项选择题

The White House is open to the public （）

A．on weekdays only
B．five days a week
C．every other day
D．on weekends only

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单项选择题
The responsibility of the police force of Public Transit is to （）

A．enhance public security
B．build a free transit system
C．control the number of riders
D．ensure a convenient transit system
填空题
What is the main purpose of this Call for Expression of Interest To invite （）to participate in the Beijing 2008 Olympic Games.
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