一般所指的绿色开花植物是( )
A:被子植物
B:藻类类植物
C:蕨类植物
D:裸子植物
【假设猜想】气体可能是HCl、NH3、H2的一种或几种.
【查阅资料】
①NH3+HCl═NH4Cl 2NH3+H2SO4═(NH4)SO4
②2NH3+3CuO △__ 3Cu+N2+3H2O
【实验探究】
—I didn't hear you come in just now.
—That's good. We tried __________ any noise, for you were sleeping.