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單項選擇題

We have stayed at Shanghai port for a long timeThe fouling on the ship’s hull greatly increases her （）.

A.power
B.speed
C.resistance
D.thrust force

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單項選擇題

We’d better （）economic speed （）fuel consumption.

A.take；save
B.to take；save
C.take；to save
D.to take；to save

單項選擇題

This machine （）out of order very often, but now it works well.

A.is used to be
B.was used to be
C.used to be
D.was used to