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
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单项选择题
Although students may be in a______position, teachers shall treat them as equals.
A．subsidiary
B．submarine
C．subordinate
D．subsequent
单项选择题
Helen was so persistent that her husband______at last.
A．conceded
B．converged
C．conceived
D．conferred
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