题目内容：

    In the 13th century, Marco Polo, the world known Italian traveller, saw many wonderful things in China. One of the things he discovered was money made of paper. People in the West did not have such kind of money until the 15th century. However, (A) 中国人在七世纪就开始使用纸币了.

Paper was invented by a Chinese man called Cai Lun almost 2,000 years ago. But it was not made in Europe until the year 1100. Four hundred years later, a German discovered that he could make the best paper form trees. After that countries rich in forests, such as Canada. Sweden, America, Finland became the most important (B) ones in paper making.

Paper can be used in many ways. It’s usually used for printing books and newspapers. But do you know that paper can be used for keeping warm? In Finland, the farmers wear paper boots to keep their feet warm in the snow. And even houses can be insulated（使绝缘）from (C)         or cold with paper.

However, we have to understand that paper still comes from trees now. (D) If we keep on wasting so much paper, there will not be any trees left some day in the near future. Every day people throw away about 2,800 tons of paper in our city. It takes 17 trees to make one ton of paper. This means that we are cutting down nearly 48,000 trees every day. The fact is that it takes more than 10 years for a tree grow.

So we must start (E)            paper right now. We can use both sides of every piece of paper. We can make useful things out of used paper. We can use china cups instead of paper ones. When shopping, we can use fewer paper bags and reuse them if we have some.

In short, we should keep a balance between using paper and protecting trees, and do it now before it is too late.

1.将画线部分（A）译成英语：______________

2.画线部分（B）指代的是：____________

3.在（C）和（E）的空白处分别填入一个适当的单词：___________；_____________

4.将画线部分（D）改写为：If we ___________ wasting so much paper, we won’t ____________ any trees left some day in the near future.

5.从文章中找出两个说明纸张用途的介词短语：____________；____________