单选题：Companies are struggling to find the right ________ between

题目内容：

Companies are struggling to find the right ________ between supply and demand, but it is no easy task. A．equation
B．formula
C．balance
D．pattern

参考答案：

答案解析：

The most basic reason why dialects should be preserved is th

The most basic reason why dialects should be preserved is that language helps to

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