最常见的肿瘤相关抗原有（ ）
A．AFP
B．CEA
C．PSA
D．CA125
E．BSA
参考答案：A,B,C,D
---What do you think of ______ Huang Bo?
---He is such _______ great actor that I like his films very much .
A．a ; an
B．/ ; the
C．/ ; a
D．the ; a
学习策略的原则有哪些？
