题目

They own a house in France as well a villa in Spain.             (    ) _____________     A  B              C         D            答案：C. 解析: 考查as well as的用法。as well换成as well as  本句中a villa in Spain和a house in France并列，所以将as well改成as well as，同时as well表示也放在肯定句的句末。下列化学式书写规范的是A．氧化镁mgO    B．氯化铝alCl3      C．五氧化二磷P2O5   D．一氧化碳CO