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依下文回答第 21 題至第 25 題High-speed rail (HSR) is a form of railway transportation which runs at a high speed. It uses anintegrated system of dedicated tracks and rolling stock to attain the high speed. While there is no singlestandard that applies worldwide, new lines in excess of 250 kilometers per hour (160 miles per hour)and existing lines in excess of 200 kilometers per hour (120 miles per hour) are widely considered to behigh 21 . The first high-speed train began its 22 in 1964 in Japan, and they were called bullettrains. They run on standard gauge rail with continuously welded rails.China’s HSR (High-speed rail) is the longest HSR network in the world; it is China’s network ofpassenger-dedicated railway. It was extended to 29 more provincial-level administrative divisions in 2017which gives it a total length of 25,000 km. This 23 approximately two-thirds of the global high-speedrailway for commercial services. In 2017 it completed nearly 2 billion trips.24 China has over two-thirds of the World’s High-speed rail, its network does not cross into theneighboring nations. The HSR crosses 25 boundaries only in Europe. Belgium is served by fouroperators TGV, ICE, Eurostar and Thalys trains all from neighboring countries. ICE trains reach Switzerlandand Belgium while TGV rail has extended to Italy, Luxembourg, Germany, and Switzerland. Eurostarconnects London to Brussels.
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(A) volume
(B) speed
(C) value
(D) security

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