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
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
单项选择题
He has impressed his employers considerably and ______ he is soon to be promoted.
A．simultaneously
B．spontaneously
C．virtually
D．accordingly
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