阅读下面一首诗，然后回答问题。

湖 州 歌（其六）

南宋 汪元量

北望烟云不尽头， 大江东去水悠悠。 夕阳一片寒鸦外， 目断东西四百州。

[注]此诗是元灭南宋时，作者被元军押解北上途中所作。

（1）简析“望”在诗中的作用。

The long-run production decision differs from the short-run production decision in that:（）

A. variable costs can be changed in the short run but not the long run.

B. variable costs can be changed in the long run but not the short run.

C. fixed costs can be changed" in the long run but not the short run.