单项选择题
A.where are you going
B.where you are going
C.where do you go to
D.that you are going
单项选择题 GM envisions a system（）connects intelligent cars to each other and to remote servers in a vast, moving peer-to-peer network that would let them（）efficiently and in sync.
单项选择题 Second, the car needs（）collisions.
单项选择题 The car will be guided by a differential GPS system that corrects errors arising in global positioning satellite signals（）they travel through the ionosphere and troposphere.