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第三部分：阅读理解(共两节，满分50分) 第一节：(共20小题；每小题2分，满分40分)     阅读下列短文，从每题所给的四个选项A、B、C和D中选出最佳选项。     Have you ever dreamed of having a fashionable watch of great value?     A small watchmaker in Switzerland in 1922 designed the first automatic watch to show the day，month，and date．Only seven of these splendid watches were ever made and these watches were almost lost to history．Today，it is so hard to get an original watch that some watch historians are even willing to offer臭氧（O3）主要分布在距离地面10Km-50Km的高空，形成臭氧层，臭氧层吸收了太阳光中大部分紫外线，使地球上的生命免受紫外线的伤害，臭氧属于　　 （　　 ） A.单质　　　　 B.氧化物　　　　 C.化合物　　 D.混合物