单选题
"The FAA demonstration" in para. 2 refers to ______.
A、
(A) the out-dated program FAA had used earlier for air-traffic control
B、
(B) the newly devised air-traffic control program on display
C、
(C) the showing of the location of low flying aircraft and private jets
D、
(D) the graphically screened commercial airliners
【正确答案】
B
【答案解析】
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