7. With the energy crisis, people have noticed that flying cars will be a _____ that has been pictured for a long time by scientists.
(A) habitat
(B) scenario
(C) pseudonym
(D) den
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統計: A(0), B(5), C(1), D(1), E(0) #547052
統計: A(0), B(5), C(1), D(1), E(0) #547052