三角形的内角分别为55°和65°，不可能是这个三角形外角的是[ ]
A．115°
B．120°
C．125°
D．130°
答案：D
下列反应的离子方程式正确的是
A．氨气通人盐酸中：H＋＋Cl－＋NH3=NH4Cl
B．盐酸滴到铜片上：Cu2＋＋2H＋=Cu2＋＋H2↑
C．碳酸钡溶于醋酸：BaCO3＋2H＋=Ba2＋＋H2O＋CO2↑
D．澄清的石灰水跟盐酸反应：H＋＋OH－=H2O
—Is this your sister?
—_____. [ ]
A. Yes, that is
B. No, it isn't
C. Yes, this is
D. No. that isn't
