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149.In many places in China,____ bicycle is still _____ popular means of transportation.
A.a;the
B./;a
C.the;a
D.the;the
150.We went right round to the west coast by ____ sea instead of driving across___ continent.
A.the;the
B./;the
C.the;/
D./;/
n. 运输，运输系统，运输工具
