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.
A.as
B.that
C.what
D.where
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单项选择题
The TTS run will demonstrate （）the car can take curves as fast as a human driver—without driving off a cliff.
A.as
B.that
C.when
D.whether -
单项选择题
It is an early step toward a robo-car that can drive itself, perhaps（）.
A.better than you
B.better than you can
C.better you can -
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
