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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.
In order to make it stronger, gold is often mixed with______.
选项 A、hard gold
B、coin and jewelry
C、acids
D、other metals
答案D
解析 细节题。问题问为了提高其强度，黄金常常和什么融合。要注意提问中的make itstronger的意思就是文章中的give it strength，只不过变了个说法而已。明白这一点之后，我们就可到文章中去寻找give it strength了，答案肯定在它附近。找到第三节的第三句，答案就有了。
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