单项选择题

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

A．Orientation
B．Access
C．Procession
D．Voyage
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单项选择题
Mr．Smith had an unusual _____________ he was first an office clerk, then a sailor, and ended up as a school teacher.
A．profession
B．occupation
C．position
D．career
单项选择题
One sign (by which ) you are making progress in (an art) such as painting or photography is (that) you begin to realize how much (there is) to learn.
A．by which
B．an at
C．that
D．there is
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