I would like a _____ sneakers. [ ]
A. pair
B. spoon of
C. pair of
答案:C
等差数列{an}的前n项和为Sn,若a1=-11,a4+a6=-6,当Sn取最小值时,n等于( )
A.6
B.7
C.8
D.9
疔的内治大法为()
A.清热解毒
B.凉血止血
C.清热利湿
D.化湿和中
E.托毒解表