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
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单项选择题
The balances on their operating statements can not be called profits or losses, rather they are called surpluses or ______.
A．defect
B．handicap
C．deficit
D．flaw
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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