在好氧区除磷中，细菌的主要作用有（）
A.释放磷
B.存贮磷
C.产生能量
D.发酵
参考答案：B, C
精则养神 柔则养筋
My uncle is humourous. He often ___ funny jokes and always makes us ___ . [ ]
A. speaks ; laugh
B. tells ;laugh
C. says ;laughing
D. tells ; to laugh
