单项选择题

A．They stay closed until summer comes.
B．They cater chiefly to tourists.
C．They are busy all the year round.
D．They provide quality service to their customers.
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问答题
In order for space tourists to walk around and function normally, it is necessary for the space city to create a________.
填空题
A．WithinB．AfterC．ForD．Over
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