阿摩線上測驗
39. Which number is considered to be a perfect number to the Greeks?
(A) 4
(B) 5
(C) 7
(D) 13
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統計： A(336), B(21), C(47), D(9), E(0) #1367634
統計： A(336), B(21), C(47), D(9), E(0) #1367634
