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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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
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
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