单项选择题

______ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.

A．As
B．Whether
C．While
D．Now that
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单项选择题
After four years in the same job his enthusiasm finally ______.
A．deteriorated
B．dispersed
C．dissipated
D．drained
单项选择题
Fewer and fewer of today's workers expect to spend their working lives in the same field, ______ the same company.
A．all else
B．much worse
C．let alone
D．less likely
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