单项选择题

Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．A platform worker.
B．A computer.
C．The command spot.
D．A machine.
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单项选择题
A．10 points.B．2 points.C．15 points:D．5 points.
A．10 points.
B．2 points.
C．15 points:
D．5 points.
填空题
People use credit cards on condition that they have ______ .
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