A.attack
B.attraction
C.attempt
D.attention
A.people do not care about the removal of barriers between countries
B.people can not remove the obstacles made by themselves
C.man-made barriers are sometimes harder to overcome than natural ones
D.barriers should be taken for granted as they always exist
A.Barriers Made by People
B.Functions of Communication
C.Restrictions on Transportation
D.Progress o Human Society
A.would take
B.took
C.had taken
D.would have taken
A.average
B.regular
C.ordinary
D.normal
A.Whenever
B.No sooner
C.In case
D.Once
A.bear
B.carry
C.offer
D.support
A.was destroyed
B.destroying
C.destroyed
D.being destroyed
A.do
B.does
C.did
D.must do
A.assume
B.suppose
C.mean
D.hope
A.live on
B.live through
C.live up to
D.live with
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