Each oneof us shares this planet with seven billion others. And we all need1.People and products need to move from city to city and country to country.However, we all know2most cars, motorcycles, boats and planescause air pollution. They are also3. This is a seriousproblem in many cities.4inventors are coming up with creative ideasto try to reduce the pollution and noise.
In manycountries around the world, motorcycles are very5.Now Vietnam has around 33 million motorcycles and China has almost 120 million.Motorcycles are a faster and6way to get around a city than cars. Yetair pollution is a growing problem. In large cities, people7itis difficult to breathe. To solve these problems, a U.S. company designed anenvironmentally friendly motorcycle. It uses electricity as fuel (燃料). As a result, there is8pollution.It's also quiet and fast. This makes9a good choice for gettingaround a city.
TheItalian city of Venice is a city with only a few10.There are no cars in the city centre.11cars, water taxis andbuses carry people along the city's canals (运河). However, they cause pollution,12tothe water. English engineers Dick and Jem designed a solar-powered (太阳能) water taxi. The water taxi13run for a day after beingrecharged (充电).
Planesalso cause air and noise pollution. Designing an environmentally friendlyairplane is a real14. Some airplane companies have15tosolve the problems. Swiss engineers have gone one step further. They developeda solar airplane.
