1 No one can deny the fact that ...
2 The idea is hardly supported by facts.
3 Unfortunately, none of the available data shows ...
1 A good case in point is ...
2 As an illustration, we may take ...
3 Such examples might be given easily.
4 ...is often cited as an example.
分层教学就是教师根据学生现有的知识、能力水平和潜力倾向把学生科学地分成几组各自水平相近的群体,并区别对待,这些群体在教师恰当的分层策略和相互作用中得到最好的发展和提高。
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