单项选择题

While we axe making more use of nuclear power to meet the energy demand we should never neglect the _______ effect it can have on our living environment.

A．contrary
B．positive
C．negative
D．extensive
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单项选择题
Most people who travel in the course of their work are given traveling _______.
A．income
B．fee
C．pay
D．allowance
单项选择题
The soldier had qualified as a doctor, but later he gave up the ________ of medicine for fulltime training.
A．fight
B．treatment
C．practice
D．project
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