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（续上期）现代文阅读。（二）阅读下面一篇科普小品，完成１５—１８题。动物嗅觉的奥秘动物的嗅觉最敏锐，其中奥秘无穷，说来颇为有趣。哺乳动物的鼻子里，有一块薄薄的很敏感的细胞层叫嗅觉上。人类的这个嗅觉上皮细胞层仅５平方厘米，而狗的嗅觉上皮细胞则达１５０平方厘?
(Continued from last issue) Modern reading. (b) Read the next popular science sketch and complete questions 15-18. The mysteries of the animal’s sense of smell are the most sensitive to the animal’s sense of smell, and the mystery is endless. It is quite interesting to say. In the mammal’s nose, there is a thin layer of very sensitive cells called olfactory. The human olfactory epithelial cell layer is only 5 square centimeters, while the dog’s olfactory epithelial cells are up to 150 square centimeters.