饲养金鱼的人,每天都需用新鲜水置换鱼缸中的旧水,但如果在缸内

饲养金鱼的人,每天都需用新鲜水置换鱼缸中的旧水,但如果在缸内放置一些金鱼藻之类的水生植物,则可以延长换水的时间,其主要原因是:     (   )

A.金鱼藻可制造葡萄糖,供金鱼食用        

B.金鱼藻可吸附水中污物保持水的清洁

C.金鱼藻可吸收金鱼排放的CO2 ,并放出O2供金鱼利用     

D.金鱼以金鱼藻为食

答案

C

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