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做好谈话活动的准备工作，主要有几点？

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幼儿园谈话活动的类型有（）、（）。

幼儿园谈话活动的教育价值？

试分别用IF_THEN 语句和CASE语句的表达方式写出此电路的VHDL程序选择控制信号s1和s0的数据类型为STD_LOGIC当 s1=’0’ ,s0=’0’; s1 =’0’,s0=’1’;s1 = ’1’,s0 =’0’和s1 = ‘1’ ,s0 = ‘1’时分别执行y<=a、y<=b、y<=c、y<=d

1.______Americans were living in North America for many hundreds of years before Europeans reached the 2. . For a long time white people called them 3._. Today many people do not like this name since it is 4. on a mistake: it was given to the people living in the America by Christopher Columbus who, when he 5. there, thought he 6.in India. Instead, people 7.____ to use the term Native Americans.