高二英语同步课程
《完形填空之词语辨析》麻雪玲
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Pearls (珍珠)are valuable white gems (宝物)which come from the ocean. Actually they are 36 by oysters (牡蛎), small shell fish that live on the 37 of the ocean.
Only some oysters will make pearls; not all oysters produce 38 . Oysters produce pearls only 39 they are hurt, or injured, by sand. If a 40 of sand enters the oyster’s 41 , the oyster becomes hurt because the 42 grain of sand irritates(刺激)the smooth, soft skin of the oyster. The oyster tries to 43 itself by producing a white 44 that looks like milk. The oyster covers the 45 with a milky fluid. This fluid protects the oyster. Later the white liquid becomes 46 . This hardened liquid forms a shell, or bead(小珠子), around the sand. At this time a pearl is beginning to 47 .
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