如图所示，有一匀强磁场，磁感应强度B=2T，有一段长L=2m的导线垂直磁场方向放置，当导线中通以I=0.5A的水平向右的电流时，

（____）A. What's for dinner?

（____）B. What would you like?

（____）C. I'd like some beef, please.

（____）D. Would you like a knife?

（____）E. Pass me the bowl, please.

说明该城市空气质量的季节变化特点并分析夏季空气质量优于冬季的原因。

—_________.  It's OK.