第1个回答 2016-11-13
I think computer is a very useful invention. For example, computer can send some messages to foreign friends by E-mail. The computer can open our eyes to let us know more.
Computer is the most helpful invention in the world. Computer can help us in study or work. There are many computer functions .We can listen to music or play the game on computer. It makes us relax.
More importantly, the computer can open our eyes to let us know more.
More and more inventions make our lives more interesting. The mobile phone is one of the most important tools for the people nowadays. It was invented by Martin Cooper in 1973. The mobile phone has really changed our lives. We could talk to people far away, send messages, take photos and do many other things with the mobile phone. However, there’s also a lot of problems .It’s too noisy and unhealthy to people. If you use it very often, you will feel it very noisy and it’s kind of bad for your health. Sometimes, it’s too expensive. Everything has two sides.
Kar Benz invented the car in 1886. It is one of the most useful inventions in 19th century. Cars are more comfortable than buses. And cars are much faster. You can save a lot of time when you drive a car. Cars attract a great number of people all over the world, they enjoy driving very much. However, cars also bring a lot of problems to us. they are expensive. And they are noisy and they make the air dirty, so they make pollution more serious. I think we should use cars in the right way, in order not to change it to an annoying invention.
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第2个回答 2016-11-13
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I I think...ia a very useful invention.think...iaaveryusefulinvention.Static benefits are generated from peaking and valley-filling, which are further divided into capacity benefits and coal savingbenefits.本回答被网友采纳