粗饲料的共同特点是()。
参考答案:含粗纤维高
下列反应属于置换反应的是( )
A.3Fe+2O2 点燃 . Fe3O4
B.CaCO3 高温 . CaO+CO2↑
C.CuSO4+2NaOH=Cu(OH)2↓+Na2SO4
D.C+2CuO 高温 . 2Cu+CO2
______ was developed in the late 19th century as a reaction against the Grammar-Translation Method.
A. The Oral Approach B. The Audiolingual MethodC. The Direct Method D. The Cognitive Approach