电气化铁路接触网导线距轨面必须保持一定的距离，接触线最大弛度时距轨面的最低高度：一般中间站和区间站为（）mm。

A、6200

B、5330

C、5500

D、6500

Which of the following led to the growth of ice trade according to the passage().

A.The growth of the American population.

B.The expansion of cities.

C.The change of the diet of ordinary citizens.

D.The increasing need for food.