A. [12, 34, 56, 78] B. [1,2,3,4,5] C. ([12, 34, 56, 78]) D. ( [1,2,3,4,5])
A. [[‘shandong':200], ['hebei':300],['beijing':400]] B. ['shandong', 'hebei', 'beijing'] C. ['300','200','400'] D. [300,200,400]