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  3. Some people’s ears produce wax like busy little bees. This can be a problem

Some people’s ears produce wax like busy little bees. This can be a problem

游客2023-08-28  49
问题     Some people’s ears produce wax like busy little bees. This can be a problem even though earwax(耳垢)appears to serve an important purpose.
    Experts say it protects and cleans the ear. It【B1】______ dirt and other matter and keeps insects out Doctors think it might also help protect against【B2】______ diseases. And the waxy oil keeps ears from getting too dry. So earwax is good. And there are two kinds. Most people of European or African【B3】______ have the "wet" kind: thick and【B4】______. East Asians commonly have "dry" earwax.
    But you can have too much of a good thing. Some people may have too much wax in their ear canal. Earwax is normally【B5】______; it falls out of the ear or gets washed away. But【B6】______ wax can harden and form a blockage that【B7】______ with sound waves and reduces hearing. People can also cause a blockage when they try to clean out their ears—but only push the wax deeper inside. Earwax【B8】______ is sometimes necessary.【B9】______
    Experts at N.I.H., the National Institutes of Health, suggest some ways to treat excessive earwax yourself.【B10】______. Another way to remove wax is known as irrigation. With the head upright, take hold of the outer part of the ear. Gently pull upward to straighten the ear canal.【B11】______. Then turn the head to the side to let the water out. [br] 【B3】
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答案 descent
解析 根据空格前面的European or African，可知此处需要一个名词。descent“血统”。
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