实验室制备二氧化硫气体，下列方法最适合的是（ ）
A：Na2SO3（固）+H2SO4（浓）=Na2SO4+SO2↑+H2O
B：4FeS2（固）+11O22Fe2O3+8SO2
C：C+2H2SO4（浓）=△CO2↑+2SO2↑+2H2O
D：2CuSO42CuO+2SO2↑+O2↑
（2015•莱芜）已知m+n=3，m﹣n=2，则m2﹣n2=____
不能直接置于火焰上加热的仪器是（ ）
Mrs Smith's living room is large. There is a television in the room. The television is near the window. There are some magazines on the television. There is a table in the room. There are some newspapers on the table. There are some armchairs in the room. The armchairs are near the table. There is a stereo in the room. The stereo is near the door. Mrs Smith often listens to music from it.
