The ancient Chinese called jade the stone of immortality. It has been used as adornment by women for thousands of years. Cut

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问题     The ancient Chinese called jade the stone of immortality. It has been used as adornment by women for thousands of years.
    Cutting and polishing the raw stone is a tedious process. It often takes months. After initial cutting, a piece is ground to its desired form—being passed from rough to smooth grindstones. "Our job is to subtract; we cannot add," smiles an experienced carver.
    In judging jade, a little knowledge is often a dangerous thing. It is the easiest gem to imitate. Some of the cheap natural jade can be dyed to a beautiful green. Cruder imitations are made of glass or plastic; but these are easier to detect, since they are smoother than the real gem, which has a slightly uneven surface and a rather greasy look.
    No two gems are alike. Jade is priced according to its colour and translucence(半透明的). Prices range from a few dollars for an opaque(不透明的) , dull-green stone to thousands for one with a true, clear, emerald green. The guidelines for buying jade are few and simple: Buy jade only after having seen it under natural light. Use another piece of good quality for comparison. Beware on unusually low prices. Finally, go to only reputable jewelers.
A piece of "jade" made of glass or plastic is________.

选项 A、uneven
B、greasy
C、rough
D、smooth

答案D

解析
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