Listen to the passage for the first time, focus on the global idea of the passage and then choose the right answers to the questions you hear.音频31.What is America’s challenge in the 21st century according to the passage?
A.
Connecting small towns to big cities.
B.
Building the largest transportation network in history.
C.
Maintaining the operation of the transportation network.
D.
Solving the traffic problems in New York.
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【单选题】A suspected man may deny a charge, but his fingerprints can ________ him even when there is nothing else to even say who he is.