如图所示，电源电压恒定不变，当s闭合后，滑动变阻器的滑片p向右移动的过程中，下列说法正确的是

A．灯泡亮度不变，电压表示数变大

B．灯泡变亮，电压表示数变大

C．灯泡变暗，电压表示数变小

D．灯泡变暗，电压表示数变大

情景交际。

用may成can的适当形式完成对话。

David :Where are you going to spend your vacation this year ,Mary?

Mary :l __1__ go to Australia with my family. I'm not sure. My mother wants to go there ,but my father would like to Africa. They    2    make up their mind.

David :Will you travel by plane or by ship?

Mary :We__3    travel by ship.

David :Is it cheaper or more expensive ?

Mary : It _  4    be cheaper ,but it takes a long time.

David : l'm sure you'll enjoy yourselves.

Mary: Don't be so sure. We__5     not go anywhere.