心理学家把“学习”看成是一个由不知到知的认识过程。()
参考答案：对
继发性腹膜炎最常见的病原菌是（）。
A.大肠杆菌
B.粪链球菌
C.厌氧脆弱类杆菌
D.金黄色葡萄球菌
E.肠球菌
20. _______, English is one of the most important subjects.
A．It is known to all that
B．As is known to all that
C．As we know
D．As it is known to all
