What is it? [ ]
A. time
B. the time
C. is time
答案:A
已知:ax+y=18,ax=6,则ay=______.
系统性红蝴蝶疮较早常见的内脏损害为
A.肺脏
B.脾脏
C.肝脏
D.肾脏
E.心脏