请阅读下面短文,根据短文内容从每小题所给的 A、B、C、D 四个选项中选出最佳选项。( )1. What is the most popular means of transportation(交通方式) among the students? A. By subway. B. On foot. C. By bus. D. By car. ( )2. If Tom leaves home at 7:10 am, when can he get to school? A. At 7:20 am. B. At 7:25am. C. At 7:30am. D. At 7:35am. ( )3. Who spends the least time on the way to school? A. Gina. B. Mary. C. Tom. D. Mike.下列有关硫及其化合物的叙述正确的是( )A. 硫单质是一种淡黄色易溶于水的固体B. SO2具有漂白性,可用于食品的漂白C. 用作“钡餐”的物质主要成分是硫酸钡D. 可用澄清石灰水鉴别SO2和CO2