单项选择题

Some would consider that an infringement of good manners whereas others would not.

A. an example
B. a violation
C. a problem
D. an indication
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单项选择题
The laser represents a true marriage between science and technology, the men who devised it were（）engineers and physicists.

A. spontaneously
B. simultaneously
C. instantaneously
D. homogeneously
单项选择题
If any law and order（）not maintained, neither the citizen nor his property is safe

A．be
B．are
C．were
D．is
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