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
Helen was s6 persistent that her husband ______ at last.
A．conceded
B．converged
C．conceived
D．conferred
单项选择题
A full ______ of all the reasons for and against closing the railway has begun.
A．explosion
B．exploration
C．exploitation
D．explanation
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