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
As the pressure ______ the liquid rock is forced up through channels in the resistant rock to the earth' s surface.
A.intensifies
B.magnifies
C.heightens
D.deviates
单项选择题
According to the author, the surprising aspect of human anger is ______.
A.its lengthy and complex development
B.a conflict such as is now going on in Northern Ireland
C.that we do not fly into a temper more often
D.that we reserve anger for mankind
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