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單項(xiàng)選擇題

When she retired she did a lot of（）work for the Red Cross.

A.valid
B.portable
C.prosperous
D.voluntary

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單項(xiàng)選擇題

What these young men were doing（）a threat to the safety of the whole neighborhood.

A.constructed
B.contracted
C.constituted
D.contributed

單項(xiàng)選擇題

Doctors hope to（）a human heart into the patient within the next few days.

A.transfer
B.transform
C.transplant
D.transport

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