（）transport of goods is the principal means of transport in many countries due to the low threshold infrastructure requirements.<br>A:rail<br>B:road<br>C:sea<br>D:air

（）transport of goods is the principal means of transport in many countries due to the low threshold infrastructure requirements.
A:rail
B:road
C:sea
D:air

出自：国际货运代理专业英语

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