A：铝片加入氯化铜溶液中：Al＋Cu2＋=Al3＋＋Cu
B：氢氧化钾溶液加入氯化铁溶液中：3OH－＋FeCl3 = Fe(OH)3↓＋3Cl－
C：石灰石加入稀盐酸中：CaCO3＋2H＋= Ca2＋＋CO2↑＋H2O
D：氢氧化钡溶液加入稀硫酸中：Ba2＋＋OH－＋H＋＋SO42－=BaSO4↓＋H2O
下列几组动物中，体温不恒定的是（ ）
A: Welcome to my birthday party, Billy!
B: Happy Birthday to you, Amy! This is for you·
A: Oh, a beautiful doll! It's blue. I like it. Thank you!
B: Who's that women in the long blue skirt?
A: She's my aunt. Her name's Wendy.
B: What does she do?
A: She's a teacher.
