閱讀理解
Meteorites (隕石) are lumps of rock and iron that hit Earth from outer space. Some of them are almost solid iron. We don’t know for sure, but the first iron that men used for tools and weapons might have come from meteorites. Iron is much heavier than most rooks. Early man would have noticed this.
It is thought that the centre of Earth is almost all iron, like the meteorites. But iron found on Earth’s surface is mixed with other things. Rock with lots of iron in it is called iron ore (鐵礦石).
Iron ore is found in many places on Earth. There is much of it in Canada, but there’s a lot more of it in the United States—near Lake Superior (蘇比利爾湖). Ships carry iron ore across Lake Superior and the other Great Lakes to steel mills in such cities as Chicago, Pittsburgh, and Detroit.
Steel is iron that has something called carbon in it. The carbon helps make the steel very hard. At first, steel was made by hammering heated iron on an anvil (鐵砧) with a little carbon dust. Then a hundred years ago, Henry Bessemer in England and William Kelly in America discovered a better way of making steel. They made it in a big container called a crucible (坩堝). They loaded the crucible with hot melted iron and carbon and had air blown through it from the bottom. A few years later a still better way of making steel was discovered. It was called the open-hearth method (平爐煉鋼法). And a lot of steel is still made in this way.
For making certain special kinds of steel, where the heat and the chemicals must be measured very carefully, an electric furnace is used. Recently, still another way of making steel was discovered. This is really an improvement on the openhearth way. Oxygen gas is blown into the hot melted iron at the top of the giant furnace.
Most steel is carbon steel. This is the kind of steel that is used in making such things as bridges, automobiles, boilers, ships, and railroad tracks.
1.Which of the following statements would the author be able to agree?
[ ]
A.We know for sure that the first iron used comes from me teorites.
B.It is doubtful that the first iron used comes from meteorites.
C.It seems likely that the first iron used comes from meteorites.
D.We have no idea that the first iron used comes from meteorites.
2.Iron on earth’s surface exists in ________.
[ ]
3.The best way of steel making mentioned in the passage is ________.
[ ]
A.by hammering heated iron on anvil with carbon dust
B.by loading a crucible with hot melted iron and carbon and having air blown through it from the bottom
C.the open-hearth mehod
D.the top-blown oxygen method
4.An electric furnace is needed for making a special kind of steel because ________.
[ ]
A.it is easy to operate
B.it meets the requirements of careful measurement of its heat and chemicals
C.it is an improvement on the open-hearth way
D.it can improve the quality of ordinary steel materials
5.According to this passage, by adding carbon to the melted iron, one can make steel ________.
[ ]
A.very springy or magnetic
B.rust resistive
C.very strong
D.Both A and B
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