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《完形填空之词语辨析》麻雪玲
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The 48 pearl grows slowly inside the oyster’s shell. 49 , it takes about six or seven years for the oyster to produce a pearl. Not all oysters produce pearls 50 most oysters sometimes take sand into their shells. Only sand 51 the oyster cannot get rid of will irritate it. In other words, if an oyster “swallows” some sand, it will 52 to “spit it out”. If the oyster cannot get rid of the sand, then it will produce the white fluid to protect 53 . Actually, only about one in a thousand oysters will produce a 54 ; that is, 55 than I percent.
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