单选题
For thousands of years people thought of glass
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something beautiful to look at. Only recently
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come to think it of something
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. Shops display their goods in large.
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windows. Glass bottles and jars
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food and drink allow us
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the contents. Glass
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spectacles, microscopes, telescopes and many other very useful and necessary things.
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, or glasses, are used by people who cannot see
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or by people who want to
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their eyes from bright light. Microscopes make tiny things
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so that we can examine them. Telescopes make objects that are far away appear
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to us.
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in recent years plastics have replaced glass under conditions
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glass might be
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broken, there are new uses
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for glass that
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never imagined in the past. Perhaps the greatest advantage of glass is
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its parts are
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and can be found
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the world.