细菌的合成代谢产物是指（）
A.热原质
B.毒素
C.透明质酸酶
D.色素
E.抗生素
参考答案：A, B, C, D, E
一______ is your father?
— A bank clerk. He works in a bank near my home.
A．Where
B．How
C．What
D．Which
A．
B．
C．
D．
