练习时间练习时间Energy on wheels  P1Energy on wheels  P1WordsWordsrank // (动词) 排名rank // (动词) 排名matter // (动词) 重要，要紧matter // (动词) 重要，要紧freely // (副词) 自由地freely ……

wheels to run. It uses a magnetic field (磁场) within the tracks (轨道), according to China Daily. So there is no friction (摩擦力)! It’s greener because it uses less energy. The train can carry up ……

有趣的轮子Wheels help us go.A bus has four wheels.A bike has two wheels.Where else can we find wheels...鞋Have a goCan you name a thing with three wheels? ……

wheels would break more easily and need more energy to spin. The cutting wheel is flat, not pointed (尖的) — pointed wheels would break more easily and need more energy to spin. A TBM can work ……

crazy (疯狂的) ideas and inventions for then. Let’s take a look at them. Chocolate energy 巧克力燃料People are finding ways to save energy. So people are beginning to make electric cars (电动汽车) and solar cars ……

轮)!Ferris wheels sit in the middle of some great cities around the world. These tall, wide wheels move... single piece of steel work ever made. Ferris wheels quickly became tourist attractions (旅游景点).Now ……

are looking for ways to save energy. They make electric cars (电动汽车) and solar cars (太阳能汽车). What else can be the new energy for cars? Maybe food. In 2007, two British men made a special car. The car can ……

. If two are heading the same way for a while, the vehicles connect, with one car’s rear (后面的) wheels matching up with the front wheels of another car. Up to 10 @Ants can be put together ……

, it is a big robot that weighs 140kg. It is about 1.5 meters long and 1.1 meters tall. With six wheels... on the moon. Chang’e-3 will work at the landing site for one year. They both get energy from the sun ……

车).Chinese scientists invented the Mars rover. What does it look like? It has six wheels and four blue...能板). They change sunlight into energy. The rover will go to Mars in 2020. Scientists will use ……

Planet.The rover will weigh about 200kg and have six wheels. It will work for 92 days on Mars. It will get energy from the sun.But China’s Mars probe doesn’t have a name yet. There will be a public ……

motorcycle.Speeder doesn’t have wheels (轮子) like other motorcycles. It has a touch screen (触摸.... In the future, the company will use clean energy to run Speeder.Did you know?• Speeder riders must weigh ……

wheels would break more easily and need more energy to spin. A TBM can work as deep as 75 meters... through rock and soil. The cutting wheel is flat, not pointed (尖的) ‑ pointed wheels would break ……

polite.Jack: Too polite?Tom: When we came to a fence (栅栏), he let me go first.JOKEPIERThe wheels firstFather: If this car is made of chocolate, which part will you eat first?Son: I will eat the wheels ……

wheels. It will work for 92 days on Mars. It will get energy from the sun.But China’s Mars probe...能板). They turn sunlight into energy.The probe will go to Mars by (在……之前) the end of 2020. It will have to travel ……