阿摩線上測驗
77 The idea of setting aside national parks can be traced back to _____.
(A) thousands of years ago
(B) the nineteenth century
(C) the first half of the twentieth century
(D) the twenty-first century
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統計： A(0), B(1), C(0), D(0), E(0) #3382284
統計： A(0), B(1), C(0), D(0), E(0) #3382284
