茯苓抗肿瘤作用的机制是()
A.抑制机体免疫功能
B.抑制肿瘤细胞的DNA合成
C.直接杀灭癌细胞
D.增强肿瘤细胞的免疫原性
E.抑制非特异性免疫功能
参考答案:B
--Excuse me, Mr. Li, I don't know the meaning of the whole sentence. What shall I do?
---You'd better first ____ the new words. [ ]
A. look for
B. look up
C. look through
D. look at
大头瘟的主要临床特征是()。
A.咽喉红肿疼痛
B.憎寒壮热
C.头面热肿痛
D.耳前后硬肿
E.两侧腮肿