澶渊之盟在客观上所起的重要作用是
①削弱了契丹势力②维持了辽宋之间的和平关系
③辽宋之间开展了经济文化交流④消除了民族矛盾[ ]
A.①②
B.③④
C.②③
D.①③
答案:C
He came to my lecture every week, but his look ___ that he was not really interested.
A.expresses
B.described
C.explained
D.suggested
患者,男,40岁。大便10日未行,腹满硬痛,发热烦躁,舌苔焦黄,脉沉实有力。用药宜首选( )
A.攻下药B.峻下逐水药C.润下药D.清热解毒药E.清热泻火药