下列各数中一定是正数的是[ ]
A.(a+1)2
B.a2
C.|a+1|
D.a2+1
答案:D
When she was awake, she found that she was on seemed to be a piece of stone.
A.lying; that
B.laying; which
C.laying; it
D.lying; what
羌活除祛风散寒外,又有的功效是()
A.行气宽中
B.通窍止带
C.化湿和胃
D.胜湿止痛
E.平喘利尿