【科学60秒】没有噪音不是我的错_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】没有噪音不是我的错

听力简介：

[Sound clip] That's the future sound ___1___ city streets. If President Obama has his way there will be one million electric vehicles on the road by 2015. This week the National Highway Traffic Safety Administration started a process to determine what should be done to make it easier for pedestrians and others who share the road to ___2___.

[clip 1] That electronic [sound clip] is one of several alternatives if the NHTSA decides to require these cars to add sounds. Here's another [sound clip].

The goal is to give an audio cue, not unlike the beeping associated with the ___3___ of large trucks. Why? Well, a study led by psychologist Lawrence Rosenblum of the University of California, Riverside found that ___4___ test subjects could hear an internal combustion engine 36 feet away but didn't hear a hybrid until it was a mere 11 feet away.

That left ___5___ few seconds to react before the hybrid reached them. And that's not safe. Which is why the electric or hybrid cars of the future may sound so, well, futuristic.
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