It is also very difficult to make transportation construction on the surface of the country due to its harsh long winter and its mountainous terrain. It's really amazing for this country to set up a transcontinental railroad since last century. Until 1990, the route length was more than 86,880 kilometers. Most of the country's freight are transported by Canadian National Railway and Canadian Pacific Railway. But nowadays fewer and fewer people travel by train. Water transportation was very important before railway construction.24. Airplanes are important in transportation in Canada _____.

It's very necessary for Canada to set up effective transportation system because of its enormous size with its sparsely populated distribution. It is also very difficult to make transportation construction on the surface of the country due to its harsh long winter and its mountainous terrain. It's really amazing for this country to set up a transcontinental railroad since last century. Until 1990, the route length was more than 86,880 kilometers. Most of the country's freight are transported by Canadian National Railway and Canadian Pacific Railway. But nowadays fewer and fewer people travel by train. Water transportation was very important before railway construction. 24. Airplanes are important in transportation in Canada _____. A. because they can fly very high B. because they can carry larger freight to the destination within shorter time C. because they are the newest form of transport D. because they can go to some areas that cannot be reached by other transports