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找不到好的英语六级听力练习材料?绝对是你的不二选择。大家平时多用英语磨耳朵，时间长了英语六级听力绝对会有很大的提高。 英语六级听力练习：标准4.11 点击收听 After successfully flying their solar-powered plane from Spain to Morocco in 2012, and across the U.S. in 2013, Swiss aeronautical enthusiasts are now getting ready to attempt a flight around the world next year. The new, improved version of the plane, named Solar Impulse 2, was recently unveiled in Switzerland. Solar Impulse 2 is a single-seat airplane with a wingspan of 72 meters, but it weighs only about the same as a large car. The wings provide about 200 square meters of space for solar cells that charge lithium-ion batteries, needed to keep it flying at night. Its four electric motors allow it to cruise at a speed of up to 140 kilometers per hour, at an average altitude of 8,500 meters. The longest flight of its predecessor, Solar Impulse 1, made in May 2013 from Phoenix, Arizona to Dallas, Texas, was just over 1,500 kilometers. But pilot Andre Borschberg, who once flew jets for the Swiss Air Force, says Solar Impulse 2 - with favorable weather - will be able to fly much longer distances between stops. When we leave the coast of China, we dont know what the weather looks like on the other side of the ocean. So these are big question marks, said Borschberg. | 
