下列药物中哪个具有解热消炎镇痛作用()
A.依他尼酸
B.对氨基水杨酸
C.维生素C(抗坏血酸)
D.克拉维酸
E.双氯芬酸钠
参考答案:E
用简便方法计算:20012-4002×2000+20002=______.
He was able to play the piano________the age of four. [ ]
A. in
B. of
C. at
D. to