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補全短文：

Is all this concern a waste of human effort? ________.Are we losing our sense of what is reasonable and what is unreasonable?

A.Life seems to have grown too tough for black robins.

B.Is it any business of ours whether the black robin survives or dies out?

C.The organizers say that Little Mangere should then be restocked（重新準備）with the robin's food.

D.Energetic steps are being taken to preserve the black robin.

正確答案：B

答案解析：前后句分別為問句，選項B與其共同構成了三個排比的問句結構。所以，選項B是合適的選項。

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