用下图所示装置进行实验，不能达到实验目的的是：（ ）

甲                                  乙

丙                                  丁

A．用甲装置比较硫、碳、硅三种元素的非金属性强弱

B．用乙装置可制得金属锰，用同样的装置可制得金属铬

C．用丙装置可实现对铁钉的保护

D．用丁装置验证铜与稀硝酸反应的气体产物只有NO

Which of the following statements is true according to what you have heard

A．I will eat lunch very quickly.

B．I will have lunch before the meeting.

C．I will eat lunch at the meeting.

D．I will eat lunch while jogging.