________（50）A.Experts say that we cannot do that
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________（50）
A.Experts say that we cannot do that just yet.
B.In the near future,intelligent cars will be put into commercial operation.
C.This is the brain of the car.
D.But how does an intelligent car control itself?
E.It completes the processing of the images sent by the cameras within 100 milliseconds.
F.However,it cannot recognize moving people and bicycles on ordinary roads that have no clear markings on them.
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答案：F
选项F中的recognize , marking（记号）和road（道路）分别与空格前句中的recognize, mark（标志）和lane（车道）形成呼应，而F项中的代词it在前文中有指代的内容，指代前句中的intelligent car，因此F项是正确答案。