文字传承着人类文明,我国有文字可考的历史开始于[ ]
A、夏朝
B、商朝
C、西周
D、东周
答案:B
________ cave that George has discovered in his lifetime is near the Alps.
A.The hundredth
B.The hundred
C.Hundredth
D.A hundredth
下列出血中,哪一项是经皮经肝食管胃底静脉栓塞术(PTO)的适应证( )。
A.小肠出血 B.结肠出血C.大咯血 D.食管曲张静脉破裂急性出血期E.脑出血