Honda thinks that they could go into full-scale production of the FCX Clarity by 2020 if the world is prepared for them by then.

　　Then there are hydrogen-powered buses in several European cities including Amsterdam, Barcelona, Hamburg, London, Luxembourg and Madrid. Lotus, the makers of London taxis, have announced that they propose to manufacture hydrogen-powered taxis in time for the London Olympics.

　　So, the hydrogen vehicle is out there and the numbers will be growing fairly soon. The buses go back to their bus station, where an electrolyzing machine changes water into fuel for them to fill up on and the same will be the case for many of London’s taxis.

　　Unfortunately, getting fuel is not the only difficulty for the average motorist, a number of these vehicles cost about $300,000 each.

　　47.According to the text, hydrogen-powered buses ________.

　　A. can easily be filled up with gas.

　　B. are likely to sell well in the future.

　　C. are mainly used in the United States

　　D. won’t be used in the London Olympics

　　48. What does the underlined word “them” in paragraph 5 refer to?

　　A. Japanese companies

　　B. Hydrogen buses

　　C. The FCX Clarity

　　D. Filling stations

　　49. Where are hydrogen cars currently available for sale?

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