听下面一段短文，回答以下小题。
【小题1】How can people operate a self-driving car?

A．By calling the operator.

B．By pressing some buttons.

C．By telling the car their destinations.

【小题2】Where do self-driving cars mainly appear?

A．In Chicago.

B．In California.

C．In Los Angeles.

【小题3】Why did the police order the Google car to stop?

A．It broke the law.

B．It hit another car.

C．It broke the speed limitation.

【小题4】How far have self-driving cars driven?

A．About 2 million kilometers.

B．About 9 million kilometers.

C．About 19 million kilometers.