程序文件属于哪一级文件？
水稻产量构成的要素主要有（） ["亩穗数；","亩株数；","千粒重；","穗粒数；"]
A historical study of language is a （）study of language. ["synchronic","diachronic","prescriptive","comparative"]
社区服务的社会化意味着“社区服务社会办”，它强调政府、社团、企事业单位、居民群众等各种力量共同参与，而不是政府包办。
In modern linguistics, speech is regarded as more basic than writing, because （） ["in linguistic evolution, speech is prior to writing","speech plays a greater role than writing in terms of the amount of information conveyed","speech is always the way in which every native speaker acquires his mother tongue","All of the above"]
读世界局部地区气候类型分布图，回答下列问题。
（1）左图中与乙气候类型对应的地区是（）（填字母）。
（2）与乙气候相比较，甲气候的降水有何特征。
（3）说出B地夏季的盛行风向并简析形成原因。
（4）分析C地气候对农业生产的限制性条件和有利条件。
