单选题
According to the old-timers, on two occasions ______.
A、
the water of the lake turned red
B、
lake water sprouted into the air
C、
the Gnats invaded the countryside
D、
fish in the lake suddenly died
【正确答案】
D
【答案解析】
原文：In 1833 and again in 1846，fish in the lake suddenly died．
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