题目

On a sunny day last January, people got together at a parking lot in Las Vegas to see small vehicles that looked more like colorful eggs than ordinary cars. These vehicles were electric, ran on two wheels instead of four and held only two passengers. Thanks to their tiny size, six of the vehicles would fit in a parking spot. If the idea of parking such a small car makes you nervous, don’t worry: these cars can park themselves. And they can return to their owners when controlled by a button on a cellphone.The vehicle is called the EN-V(Electric Networked-Vehicle). It is built by General MotorAlice can look after the children. She is a        （可靠的）person .