With more and more cars running on t

单选题 With more and more cars running on the roads and the worsening air quality, many people begin to turn to clean fuels. What can car makers do to develop the technology of using clean fuels? Now listen to a news report and choose the best answer to each of the questions you hear.

A、 Some companies are competing to develop hydrogen energy.

B、 Some companies are competing to develop hydrogen fuel-cell cars.

C、 Some companies joined together to resist the development of hydrogen fuel-cell cars.

D、 Some companies joined together to promote the use of hydrogen as a renewable source of energy.

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