Each one of us shares this planet with about 7.7 billion others. And we all need transportation. People and products need to 1 from city to city and country to country. However, we all know 2 most cars, motorcycles, boats and planes cause air pollution. They are also 3 . This is a serious problem in many cities. 4 inventors are coming up with creative ideas to try to reduce the pollution and noise.
In many cities around the world, motorcycles are very 5 . Motorcycles are a faster and cheaper way to get around a city than 6 . Yet air pollution is a growing problem. In large cities, people 7 it is difficult to breathe. But in China, people usually ride environmentally friendly motorcycles. They use electricity as fuel (燃料). As a result, there is 8 pollution. It's also quiet and fast. This makes 9 a good way to get around a city.
The Italian city of Venice is a city with only a few 10 . There are no cars in the city center. 11 cars, water taxis and buses carry people along the city's canals (运河). But they cause pollution, 12 to the water. English engineers designed a solar powered (利用太阳能的) water taxi. The water taxi 13 run for a day after being recharged (充电).
Planes also cause air and noise pollution. Designing an environmentally friendly airplane is a real 14 . Some airplane companies have 15 to solve the problems. Swiss engineers have already developed a solar airplane. This plane holds the world record for the longest solar powered flight.
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