9的相反数是______．
根据相反数的概念，则
9的相反数是-9．
After living twenty years in the USA，Mary finally decided to ______ American citizenship.[ ]
A. concentrate on
B. apply for
C. look out for
D. appeal to
与内湿证的形成关系最密切的脏腑是（）
A.肝
B.心
C.脾
D.肺
E.肾
