[填空题]

{{B}}Modes of Transportation{{/B}}

There are a variety of means for transportation. Usually,
the choice of transportation depends on the (1) ______ of goods (1) ______
and the points of distribution.
There are five major means of transportation: railroads,
airplanes, ships, trucks, and pipelines. Often, goods may be
transported by a combination of (2) ______ (2) ______
Railroads are best adapted to the transportation of
(3) ______ products that are low in value in relation to their (3) ______
weight. Truck lines are effective for transporting high-value
goods short distances. With the (4) ______, trucks can reach (4) ______
almost every destination without (5) ______ goods. Air freight (5) ______
used to be a means to speed (6) ______ or expensive but light (6) ______
products, but this changed

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