不属于理气药主要归经的是()
A.脾经
B.胃经
C.肺经
D.肾经
参考答案:D
设Sn为等差数列{an}的前n项和,S4=14,S10-S7=30,则S9=______.
He is better than me_______ swimming.
A.in
B.at
C.on
D.after