氨基酸是组成蛋白质的最基本单位。()
参考答案:对
吐血色红或紫暗,口苦胁痛,心烦易怒,寐少梦多,舌质红绛,脉弦数。治疗宜选()
A.泻白散合黛蛤散
B.龙胆泻肝汤
C.二者均是
D.二者均非
—_____ the baseball on the sofa?
—No, it _____. [ ]
A. Is; is
B. Are; are
C. Is; isn't
D. Are; aren't