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單項選擇題

The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.

A.suction
B.compression
C.expansion
D.exhaust

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單項選擇題

The fine filters will be arranged （） one can be cleaned while the other is operating.

A.in order to
B.because of
C.so that
D.so as to

單項選擇題

The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.

A.play a great part on
B.run a role in
C.plays an important part in
D.acts as important part at

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