A-A+
Algae under normal conditions in rivers ______
问题详情
Algae under normal conditions in rivers ______ .
A．consume the available nutrients
B．make the oxygen balance
C．force other organisms out of rivers
D．overgrow and die请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：B
解析：该句提到的Under normal conditions, algae contribute to the oxygen balance in rivers...明确指出海藻在河里的作用是使氧气平衡，故[B]为答案。[A]、[C]和[D]是针对此句后半句设的干扰项，是海藻数量过多时的情况，故不选。
