Themetalthathasbeenmostimportanttomanisiron（铁）.Likema...
问题详情：
The metal that has been most important to man is iron（铁）. Like many of the most important discoveries of man, how iron was first discovered and used is not known.
Steel is made from iron. It is better than iron in strength, hardness, and elasticity (**) . There are many kinds of steel which are made by mixing iron with other metals.
Iron is found in many different places on earth. When you see rocks with a red color, they probably have some iron. To get iron from the rocks requires a great deal of heat. When iron comes out, it is white hot.
Iron and steel are quite important in our life. We can see them in use all around us. Almost all of our machines are made of iron or steel. Without iron and steel, modern civilization (文明) doesnot exist.
6. The best title for this passage is________.
A. The Metals B. Iron and Steel
C. The Production of Iron D. The Importance of Steel
don't know how iron was first discovered and used because ________.
A. there was no record of it in history
B. it was like many of the most important discoveries
C. it was not important who discovered and used it first
D. it was used by many people all over the world at the same time
8. Steel is better than iron because________.
A. it was made from iron B. it was more difficult to make
C. it was not found in the rocks D. it was made by mixing iron with other metals
9. How is iron made?
A. By mixing the rocks with other metals.
B. It was found in rocks that had a red color.
C. By melting the rocks at a high temperature.
D. It was taken out of the earth by digging a deep hole.
10. From the last paragraph we can get the idea that________.
A. iron and steel are modern civilization B. iron and steel are only used in machines
C. iron and steel are quite useful in the world D. iron and steel are necessary for modem life
【回答】
BBDCC
知识点：科普环保类阅读
题型：阅读理解
