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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