单项选择题

Modern forms of transportation and communication have done much to ______ the isolation of life in Alask

A．A. break downB. break intoC. break outD. break through
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单项选择题
Some plants are so sensitive ______ pollution that they can only survive in a perfectly clean environment.
A．from
B．against
C．to
D．with
单项选择题
Our new house is very ______ for the office as I can get there in five minutes.
A．convenient
B．comfortable
C．suitable
D．available
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