【单选题】A large proportion of important _________are brought about by people who step outside of conventional categories or traditional assumptions.
A. innovators
B. innovative
C. innovations
D. renovation
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【单选题】The habit of going to coffee houses was_________ by the city’s relatively small size, safe streets, good public transportation.
A. fostered
B. changed
C. sabotaged
D. formed
厂商利润最大化时，边际收益等于平均成本
A. 对
B. 错
广播电视节目是广播电台、电视台播出内容的基本组织形式和播出形式。它是一个按时间段划分、按线性传播方式安排、依时间顺序播送内容的多层次系统。
A. 对
B. 错
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