戊乒处险日 脸外戌戍曰()
A.0
B.1
C.2
D.3
参考答案:A
—_______ yellow shoes are these?
—They are my shoes. [ ]
A. Where
B. When
C. Whose
D. Who
下列反应属于置换反应的是( )
A.NH3+CO2+H2O═NH4HCO3
B.8Al+3Fe3O4 高温 . 4Al2O3+9Fe
C.2KMnO4 △ . K2MnO4+MnO2+O2↑
D.HCl+AgNO3═AgCl↓+HNO3