单项选择题

At first the ______ of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expense, it became a reality.

A．transaction
B．transmission
C．transformation
D．transition
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单项选择题
They had to ______ their way through a mist that was rapidly turning into a thick fog.
A．converge
B．grope
C．strive
D．grip
单项选择题
After this accident, it will be difficult for the government to ______ people that nuclear power stations are safe.
A．prohibit
B．persuade
C．forbid
D．hinder
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