79. What might the author mention next?
(A) Examples of exotic species to cause problems.
(B) Illustrations of the ecological differences in some places.
(C) The reasons why certain exotic species exist.
(D) Solutions to the problems that exotic species cause.
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統計: A(57), B(15), C(12), D(35), E(0) #864214
統計: A(57), B(15), C(12), D(35), E(0) #864214