题目

阅读理解;阅读下列短文，从每题所给的四个选项（A、B、C、D）中选出最佳选项。 To get cash out in the 21st century, you won’t need a bank card, a PIN(个人识别编号) or even have to move a finger. You will simply have to look the cash machine straight in the eye, declares National Cash Registers(暂存器), a multinational company that makes automated teller machines, or ATMs. NCR has shown its first example machine that is believed to be the future of banking. Instead of asking you for your PIN on a screen, the Super Teller-Stella for short, asks you 10．下列说法正确的是（　　）A．加速度变大，物体一定在做加速运动B．加速度变小，物体一定在做减速运动C．加速度越大，物体的速度变化越快D．加速度越大，物体的速度变化越大