在废水好氧生物处理过程中，去除含碳有机物起主要作用的是（），数量最多的也是异氧菌。
参考答案：异氧菌
单词拼写
1. He was hurt badly yesterday, it may p____ him playing in today's game.
2. Laughter (笑) is the best _____(药).
3. Cigarette smoking causes death and d .
4. —Can we come with you?
—Oh, Is _____ so.
5. He was in poor health because of his poor _____ (饮食) and less exercise.
肝脏是人体最大的消化腺，它分泌的（ ），对脂肪有乳化作用．
A．唾液
B．肠液
C．胃液
D．胆汁
