听力原文： For years now, the world's fastest trains, operating in Japan and France, have been stuck at a maximum operating speed of around three hundred kilometers an hour — in fact the latest Japanese bullet trains travel a bit slower than their predecessors, the emphasis of the designers being more on smoothness and economy. Now JR East, the country's largest railway company, has unveiled a much faster train, capable of sustained speed of around 360 kilometers an hour. The new train, which has been displayed in a dazzling teal color, looks very similar to the streamlined models already running on Japan's high-speed railways, except for one unusual feature — extra emergency brakes in the form. of cat's ears — this, a response to the derailment of a bullet train after an earthquake last year. The Japanese bullet trains A.can run faster than 300 kilometers an hour. B.run more smoothly. C.are more costly. D.are much more beautiful.