【单选题】【消耗次数：1】
__________, the knowledge economy has become the major characteristic (特征) of the national economy of most developed countries.
①
From time to time
②
Once in a while
③
For the time being
④
Once upon a time
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【判断题】
在交谈时可适当运用眉毛、嘴、目光在姿态的变化，表达自己对对方所言的赞同、理解、惊讶，从而表明自己的专注之情，并促使对方强调重点、解释疑惑，使交谈顺利进行。
①
正确
②
错误