单项选择题

______ to some parts of South America is still difficult, because parts of the continent are stilt covered with thick forests.

A．Orientation
B．Access
C．Procession
D．Voyage
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单项选择题
When the committee ______ to details, the proposed plan seemed impractical.
A．got down
B．set about
C．went off
D．came up
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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