单项选择题

All the parts of these washing machines are ______, so that it is very convenient tO replace them.

A．normalized
B．modernized
C．mechanized
D．standardized
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单项选择题
Having finished their morning work, the clerks stood up behind their desks, ______ themselves.
A．expanding
B．stretching
C．prolonging
D．extending
单项选择题
The European Union countries were once worried that they would not have ______ supplies of petroleum.
A．proficient
B．efficient
C．potential
D．sufficient
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