单项选择题


A．present
B．manipulate
C．transmit
D．represent
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单项选择题
A．standardsB．levelsC．degreesD．layers
A．standards
B．levels
C．degrees
D．layers
单项选择题
The heating system has recently been _______ to make it more efficient.
A．modified
B．amended
C．altered
D．changed
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