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  3. Western tattooists(纹身师)work with a special electrical instrument, something like a dentist’s drill. It holds a number of very fi

Western tattooists(纹身师)work with a special electrical instrument, something like a dentist’s drill. It holds a number of very fi

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问题     Western tattooists(纹身师)work with a special electrical instrument, something like a dentist’s drill. It holds a number of very fine needles which, for the purpose of reproducing the approved drawing, are dipped in black ink. When the current is switched on, and the instrument passed rapidly over the outline, the action of the needles drives the ink into the skin. The tattooist is constantly wiping away excess ink as he works. This is where skill is so important, for the speed of the instrument means that he must work rapidly over lines which are almost permanently covered over.
    The basic drawing then has to be coloured in, using the same method but with non-poisonous paint now replacing the ink. The average tattoo contains four or five colours, each injected with a separate instrument. How many needles are used each time will depend on the area to be covered, but it is possible to use as many as ten or twelve, giving up to 300 injections a minute. Filling in is a lengthier process than outlining, and since most people find half an hour under the needles quite enough, a major tattoo can take a number of visits to complete. Every visit will leave the skin sore and stinging, and to prevent infection on the area is finally treated with an antiseptic(消毒的, 抗菌的)cream and covered with a dressing. After a few days it finally heals over, leaving the new tattoo clearly visible under the skin.
    And there it stays, for, as those who get tattooed and think better of it soon discover that getting rid of the tattoo is a far more difficult business than getting it. The tattooist is powerless to undo what he has done and can only refer unhappy customers to their doctors who, no matter how sympathetic, are able to offer little encouragement. Removing a tattoo, if it can be done at all, has to be by one of two methods, neither of them pleasant or even completely satisfactory. The first is by surgery and skin replacement, an operation which leaves permanent marks. The other possibility is to re-tattoo over the offending design with a special acid-based substance which absorbs the colours as it goes. This is a painful and lengthy process which, though less expensive than private surgery, is still quite costly.
    It is such a common event that responsible tattooists refuse to work on areas which cannot normally be covered up. "The trouble is that most people don’t think about it until it’s too late," says one tattooist who had his own hands tattooed some years ago, and freely admits to regretting it. "I realise now that it looks in bad taste."
It’s known from the passage that a dressing is used to______.
选项 A、make colours more distinct
B、cover the outline of tattoo
C、prevent the skin from infection
D、keep the customers warm
答案C
解析 根据题干中的dressing将本题出处定位于第2段倒数第2句。该句中的不定式短语toprevent infection虽然作分句的主语，但同样也表明它是treated with an antiseptic cream andcovered with a dressing的目的，由此可知a dressing在纹身过程中的作用就是防止纹过身的皮肤感染，故答案为C)。
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