根据短文内容，选择最佳答案。

First, open the lid  (-盖子) and put water, salt, and rice in the pot. Then put the cover on the pot and close the lid. Next, press (按) the button (钮) for "white" or "brown", and then press the "start" button. Let the rice cook for about 30 minutes. You’ll hear a beeping sound when it’s finished, but you should wait about five minutes before eating. Finally, take out the pot. Bring it to the table and enjoy your meal.

小题1:What are these instructions for?   

A．A coffee maker.

B．A cassette player.

C．A fax machine.

D．A rice cooker.小题2:How many buttons do you need to press?        

A．One.

B．Two.

C．Three

D．Four.小题3:How long should you let the rice cook for about?

A．Five minutes.

B．Ten minutes.

C．thirty minutes.

D．Thirty-five minutes;,小题4:What will happen when it’s finished?  "

A．You will hear a sound.

B．You will still have to wait for ten minutes

C．The lid open.

D．The water will come out.小题5:How long should you wait before eating the rice in total?

A．Five minutes.

B．Ten minutes.

C．Thirty minutes.

D．Thirty-five minutes.

如图甲所示，A、B是某电场中一条电场线上的两点．一个带负电的点电荷仅受电场力作用，从A点沿电场线运动到B点．在此过程中，该点电荷的速度υ随时间t变化的规律如图乙所示．则下列说法中正确的是（　　）

A．A点的电场强度比B点的小

B．A、B两点的电场强度相等

C．A点的电势比B点的电势高

D．A点的电势比B点的电势低