西欧封建社会的主要阶级矛盾是[ ]
A.地主与农民阶级之间的矛盾
B.封建主与城市贫民之间的矛盾
C.封建主与农奴之间的矛盾
D.奴隶主与奴隶之间的矛盾
答案:A
---- Could you play ________ basketball when you were a primary school student?
---- No, I couldn't, but I could play ________ violin.
A.the; an
B./; the
C.a, an
D.the; /
以下除了哪一项外,均提示有肺结核病情活动(1999)
A.痰涂片找到抗酸杆菌
B.X线胸片病灶扩大
C.病灶边缘模糊
D.空洞形成
E.病灶密度高,边界清楚