The following goods need to be transported from the following starting point to the destination. What is the most suitable mode of transportation (indicated by "√" in the table)?

Highway transportation is flexible, fast and adaptable, which can meet the "door-to-door" service requirements and deliver passengers and goods directly to their destinations. It is the main mode of short-distance transportation in China. In areas lacking railways and water transportation, road transportation often becomes the "main force" of local transportation. Railway transportation is fast, with large carrying capacity and low freight rate, which can send passengers or goods to all stations in the national railway network. It is a modern transportation mode suitable for long-distance passenger and cargo transportation. The advantages of waterway transportation are large carrying capacity, low investment and low freight. The main disadvantage is slow speed and limited by natural conditions. Ships often cannot sail in strong winds and dense fog. Therefore, waterway transportation is a mode of transportation suitable for bulk goods with large transportation volume, long distance and poor timeliness. Pipeline is a modern mode of transportation, which is suitable for transporting liquids and gases. Its advantages are large transportation volume, low freight rate, low loss, safety, reliability, strong continuity and convenient management. But it also has the disadvantages of large equipment investment and poor flexibility. Air transport has incomparable advantages over other modes of transport: high speed, comfort and safety.

So the answer is:

Category and quantity of goods from the starting point to the end point: two boxes of railway, highway, river and sea emergency medicine: Beijing-Lhasa √ one ton of live fish: Miyun Reservoir-Beijing √ fifty tons of steel: Shanghai-Lhasa √ 10,000 tons of sea salt: Tianjin-Shanghai √ 100,000 tons of rice: Wuhan-Shanghai √.