参考答案：D

解析：[听力原文] Windmills are sprouting across the United States, as Americans search for non-polluting alternative energy sources. However, the industry still has work to convince Americans of the virtues of wind power. Some residents complain that the large towers are unsightly, and environmentalists have criticized the windmills as dangerous to birds. This is more of a problem at another site in Northern California, which is on a migration route. In response to complaints, owners have agreed to a temporary shutdown of some of that area’s wind turbines during this year’s winter migration.

[分析]： 因果关系的找寻和判断。 原文提到在今冬鸟类迁徙季节，风车暂时停开是对complaints抱怨的回应，显然这些抱怨的具体内容便是题干要找的原因。由此关键词定位到原文相关信息处Some residents complain the large towers are unsightly，and environmentalists have criticized the windmills as dangerous to birds. 即有居民抱怨这些高塔般的风车非常难看，一些环境保护主义人士批评风车对鸟类是危险的。由此可推断，风车暂时停开的直接原因是怕鸟类在迁徙途中受到风车的伤害。因此D项是正确答案。[解题关键] 根据上下文内在逻辑关系判断因果关系。