下列说法正确的是（  ）

①ａ处在冷锋后冷气团控制下②d处在暖锋后冷气团控制下③c处在连续性的降水天气④b比a气温高气压低

① Can I help you? ____     A. He is ill.

② What can Sarah do?  ____     B. I went there by plane.

③ What's the matter with Sam?  ____     C. She can play the piano.

④ How did you go to Beijing last winter holiday? ____     D. Red.

⑤ What's your favourite colour?____     E. Yes, I'd like a shirt.

下列能体现老师对学生关爱的有（   ）

①老师耐心指导学生做实验                                                                     ②老师对学生不管不问 

③犯了错误时，老师对我严厉批评，使我认识到了问题的严重性      ④老师经常与我们交流、谈心

如图是一个算法的程序框图，当输入的x值为3时，输出y的结果恰好是$\frac{1}{3}$，则？处的关系式是（　　）