单项选择题

You can ______ the loudness of the radio by turning the knob to right or left.

A．change
B．vary
C．alter
D．transform
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单项选择题
The distance between the earth and the sun may be said to be ______.
A．enormous
B．huge
C．vast
D．immense
单项选择题
They are ______ to industrialists, who need the valuable copper and nickel in them.
A．tempting
B．tickling
C．tormenting
D．tricking
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