21. We learn from the first paragraph that two systems of automated highways __________.
A) are being planned
B) are being modified
C) are now in wide use
D) are under construction
注:on the drawing board就是planned
22. A special-purpose lane system is probably advantageous in that ________________.
A) it would require only minor changes to existing highways
B) it would achieve the greatest highway traffic efficiency
C) it has a lane for both automated and partially automated vehicles
D) it offers more lanes for automated vehicles
注:A选项说反了
23. Which of the following is true about driving on an automated highway?
A) Vehicles traveling on it are assigned different lanes according to their destinations.
B) A car can join existing traffic any time in a mixed lane system.
C) The driver should inform his car computer of his destination before driving onto it.
D) The driver should share the automated lane with those f regular vehicles.
注:对应第二段开头
24. We know form the passage that a car can enter a special-purpose lane _____________.
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