45. Which of the following is NOT a cause to an increase in otter numbers?
(A) Their listing as a protected species.
(B) An improvement in river water quality.
(C) The removal of dangerous roads near rivers.
(D) The banning of a particular kind of pesticide. 

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統計： A(1), B(1), C(10), D(1), E(0) #3911361

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