单项选择题
On vacation with the family the driver may want to（）and talk to the kids
A.turn up B.turn to C.turn on D.turn around
单项选择题 How much control you want to turn over to the car may（）your age and where you are going.
单项选择题 GM envisions a system（）the Mobility Internet.
单项选择题 The car will be guided by a differential GPS system that corrects errors（）in global positioning satellite signals.
