It is your first day at a new school. How will you find your way around?

小题1:You get off the bus at the corner of Clark Street and 10th Street. You are closest to _________.

A．Science Lab

B．Room 4

C．Gym

D．Cafeteria小题2:The principal tells you to see Miss Mack in Room 4. You leave Office and walk __________.

A．east

B．west

C．south

D．north小题3:As you’re buying lunch, you notice that Cafeteria is opposite ___________.

A．Room 3

B．Office

C．Room 1

D．Science Lab

缓蚀剂的作用机理是缓蚀剂分子在金属表面形成保护膜，隔绝（）等腐蚀性的气体与钢材的接触，延长钢材的使用寿命。

A、天然气

B、硫化氢

C、水

D、甲烷