单项选择题
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A.6 pences.
B.6 penny.
C.6 pence.
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单项选择题
A.A flat.B.A flat with garden.C.A house.
A.A flat.
B.A flat with garden.
C.A house.
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单项选择题
By doing the tank test , the engineers can find out ______.
A.the amount of air in the plane
B.the strength of the plane structure
C.the pressure inside and outside the plane
D.the power of the airplane engines
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