阿摩線上測驗
48. Which of the following threats to coral reefs may be less directly caused by human beings?
(A) blast fishing
(B) fishing with cyanide
(C) water pollution
(D) the warming of the oceans
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統計： A(9), B(5), C(7), D(23), E(0) #1213358
統計： A(9), B(5), C(7), D(23), E(0) #1213358
