学习是一种经由练习，使个体在行为上产生较为持久改变的过程。它由三个基本环节构成：（）；（）；（）。
参考答案：定向环节；行动环节；反馈环节
阅读填空。根据短文内容及单词首字母提示补全短文。
Many people think that twins are the s 1 but they are not ! Ali and Ahmet are t 2 brothers.
They look the same in some w 3 . But in other ways they are very d 4 . Ali and Ahmet are
athletic.Ali and Ahmet b 5 like soccer. but Ali plays every day and Ahmet plays o 6 on
weekends.Ahmet likes w 7 soccer games on TV but Ali likes to play soccer, not to watch only.
Ali Ahmet are both f 8 and funny, but Ahmet is a little m 9 outgoing than Ali. Ahmet is also
a little more serious about his homework,Ali and Ahmet are very p 10 at school. And they both
have a lot of friends.
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衡量城市化水平的最重要的指标是
A．城市人口数的多少
B．城市人口比重的大小
C．城市用地规模的大小
D．城市数目的多少
