单项选择题

______ is the speed at which something moves in a particular direction.

A．Voltage
B．Velocity
C．Proportion
D．Frequency
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单项选择题
Some foreigners’ bold remarks against the authorities raised everyone’s eyebrows. The underlined part means
A．convinced everyone.
B．encouraged everyone.
C．enlightened everyone.
D．shocked everyone.
单项选择题
He subscribes to a number of journals ______ his subject.
A．relating
B．over
C．concerning
D．around
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