单项选择题

Key resources are technical personnel and aircraft spare parts which account for the largest share of the maintenance ______.

A．expenditure
B．budget
C．allowance
D．investment
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单项选择题
Material choices such as timber and steel also help to keep the house cool, while light colours have been used on the exterior surfaces to ______ heat and blend in with the surrounds.
A．compel
B．repel
C．propel
D．expel
单项选择题
A pair of night birds circled above, the ______ of their wings and their weird screams penetrating the thickening mist.
A．slapping
B．clapping
C．flapping
D．flipping
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