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
I have omitted many things which ______ a place in the book.
A．reserved
B．deserved
C．preserved
D．observed
单项选择题
Certainly man must ______ the future, and find ways of providing for his use.
A．look to
B．look up
C．look for
D．look on
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