下列脊神经与分布区域,哪些是错误的()。
A.颈1-头顶部皮肤
B.颈4-膈肌
C.胸6-胰腺
D.腰1-睾丸
E.骶3- * *
参考答案:A, B, C, D
若a=3,a+b≤0,则以下关于b的说法正确的是( )
A.b>0
B.b<0
C.b<-3
D.b≤-3
My homework is _____ done. I'II be right with you. [ ]
A. hour after hour
B. now and then
C. more or less
D. more and more