根据短文内容，选择正确答案。

     Dabing and Xiaowei usually go to school by car. They drive past a cinema, a supermarket and a toy shop. The toy shop is next to the supermarket. Yaya and Xiaoli usually go to school by bus. They go past a bank and a post office. The bank is next to the post office. Longlong usually goes to school by bike. He passes by a police station, a library and a swimming pool（游泳池）.

2013年8月4日,中国选手孙杨在巴塞罗那卫冕世界游泳锦标赛男子1 500米自由泳冠军,至此,孙杨在本届世锦赛中用3块自由泳金牌和1枚接力铜牌正式加冕“自由泳之王”。伴着泪水一路前行的孙杨逐步成长为肩负起中国男子游泳领军人物的重任。从孙杨身上我们可以看出自强精神(　　)

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①可以激励我们克服困难,奋发进取   ②就是一种奉献社会的精神

③是我们成就事业的强大动力            ④是实现人生价值的必备品质

已知X、Y、Z、W均为中学化学中常见的单质或化合物，它们之间的转化关系如图所示（部分产物已略去）．则W、X不可能是（　　）