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.