8 At the security check point, ______ can detect luggage that contains dangerous items.
(A) speed gun radar
(B) robot
(C) helicopter
(D) X-ray machine
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統計: A(0), B(0), C(0), D(2), E(0) #2787609
統計: A(0), B(0), C(0), D(2), E(0) #2787609