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
To plot Shakespeare's life is to become involved in a kind of detective story______ there are plenty of clues but very little else.
A．where
B．which
C．from which
D．when
单项选择题
The American society is______ an exceedingly shaky foundation of natural resources, which is connected with the possibility of a worsening environment.
A．established on
B．affiliated to
C．originated from
D．incorporated with
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