4. This is captain speaking: we are currently flying at an________ of 15,000 meters.
(A) altitude
(B) amplitude
(C) aptitude
(D) attitude
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統計: A(381), B(18), C(36), D(10), E(0) #2982901
統計: A(381), B(18), C(36), D(10), E(0) #2982901