方程2x+3.1×2=12的解是[ ]
A．x=9.1
B．x=2.9
C．x=5.8
答案：B
Are these your scissors? Yes, ___________.[ ]
A. they are
B. it is
C. I am
溃疡形态不规则，边缘隆起，溃疡形态和刺激物吻合（）
A.结核性溃疡
B.创伤性溃疡
C.癌性溃疡
D.腺周口疮
E.梅毒下疳
