在现代市场经济运行中，市场这只“看不见的手”和国家的宏观调控这只“看得见的手”都发挥着基础性的作用。[ ]
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两地实际距离是4千米，画在图上是4厘米，这幅图的比例尺是______．
The Chinese government has made the Mid-autumn festival a national holiday,_____ people will have a day off.
A．when
B．which
C．where
D．what
