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  3. It is only a shiny, yellow metal, but it is one of the most valuable metals on earth. Since the beginning of time, men have look

It is only a shiny, yellow metal, but it is one of the most valuable metals on earth. Since the beginning of time, men have look

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问题     It is only a shiny, yellow metal, but it is one of the most valuable metals on earth. Since the beginning of time, men have looked for this extremely valuable item, gold.
    Gold is soft and easy to form into different objects. If it gets wet, it does not rust like iron or other metals. Acids do not change it. One important reason that gold is so valuable is that it is scarce.
    Due to its softness, gold must be combined with other metals to harden it and give it strength. By hardening gold, people can then make coins and jewelry with it. Metals commonly mixed with gold are nickel, platinum, and copper. Gold jewelry bears a number and the letter K. The K means karat(carat), which is a measure of the amount of pure gold in the jewelry. Pure gold is 24K. Therefore, a necklace which is 14K is fourteen parts gold and ten parts other metal.
    Many countries utilize gold for certain coins, but this practice is not as common now as it once was. The United States, for instance, stopped making gold coins in 1933.
Which of the following would be the best title for this passage?
选项 A、A Valuable Metal—Gold
B、Looking for Gold
C、Jewelry and Coins
D、What is Karat
答案A
解析 主旨大意题。题干的大意为：下列哪一项为最佳标题?主旨大意题既可以以问中心思想的方式出现，也可以以选择最佳标题的形式出现，本题即属后者。整篇文章都围绕贵重金属黄金展开，且文章开头第一句也可帮助确定中心思想，所以选择正确答案A应该不难，其他选项文中虽有涉及但都偏窄，不能概括全文。
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