Some plastics behave in a similar way to 1 ……… in that they melt under heat and can be moulded into new forms. Bakelite was unique because it was the first material to be both entirely 2 ……… in origin, and thermosetting. There were several reasons for the research into plastics i...
We still do those things today, but these days we mostly use wind power to make electricity. Wind power is a very popular source of energy. Most people think that we should use it more and more. First of all, it’s clean. Windmills don’t pollute the environment at all. Second, we...
Wind power is a very clean source of energy. This is how wind power works. Wind makes windmills spin(旋转). When the windmills spin, they make electricity. Then we can use the electricity. A lot of people think that wind power is new, but that's not true. For thousands of years, ...
It is everyones duty to do someting good to the environment around us.As middle school students, we can also do a lot of helpful things.For example, we can protect it by not throwing rubbish away.We can save water to make full use of it. We can use materials which do no harm to t...
For thousands of years, people have used wind to sail boats and move water. We still do those things today, but these days we mostly use wind power to make electricity. Wind power is a very popular source (来源) of energy. Most people think that we should use it more and more. ...
We still do those things today bur these days we mostly use wind power to make electricity. Wind power is a very popular source of energy. Most people think that we should use it more and more. First of all, it\s clean. Windmills don\t pollute the environmen...
We still do those things today, but these days we mostly use wind power to make electricity.Wind power is a very popular source of energy. Most people think that we should use it more and more. First of all, it's clean. Windmills don't pollute the environment at all. Second, we ...
For thousands of years, people have used wind to sail boats and move water. We still do those things today, but these days we mostly use wind power to make electricity. Wind power is a very popular source of energy. Most people think that we should use it more and more. First of ...
题目Wind power is a very clean source(资源)of energy.This is how wind power works.Wind makes windmills(风车)spin(旋转).When the windmills spin,they make electricity.Then we can use the electricity.A lot of people think that wind power is new,but that's not true...
For thousands of years, people have used wind to sail boats and move water. We still do those things today, but these days we mostly use wind power to make electricity. Wind power is a very popular source of energy. Most people think that we should use it more and more. First of ...