白头翁汤的功效是（）
A.清热化湿，涩肠止痢
B.清热解毒，凉血散瘀
C.清热解毒，凉血止痢
D.清热凉血，消肿止痛
E.清热泻火，凉血止血
参考答案：C
Tony _____ a prize in the singing competition.
A． beat
B． took
C． won
D． bought
金属很容易从硝酸中置换出氢气。
