What the boy said sounds ______.[ ]
A. reason
B. reasonable
C. reasonably
D. reasoning
答案:B
按要求解下列方程
(1)y2-2y-4=0(公式法) (2)2x2―3x―5=0(配方法) (3)(x+1)(x+8)="-12 "
薄荷为唇形科植物,可制高级香料和药品.其()含薄荷油。
A.全草
B.叶
C.茎和根
D.花