单项选择题

If you hear the fire（）, leave the building quickly.

A．warning
B．alarm
C．signal
D．bell

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单项选择题

Columbus had accomplished one of the most amazing and courageous（）in history.

A．performance
B．feats
C．events
D．acts

单项选择题

Marketing is（）just distributing goods from the manufacturer to the final customer.

A．rather than
B．other than
C．bigger than
D．more than

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