Last year, some groups of students in their community (社区) made a survey about “How do people spend their free time? ” The following diagrams(图表) show some results of it:
    Diagram (1): Hours for people of different ages who surf the Internet in a week.

    Diagram (2): Different days people go to the library. (library attendance)

    Diagram (3): Different programs people like.

下列属于今天青藏牧区的生活变化的有  (    )

①有的牧区建起了定居点      ②牧区在水利建设方面有了改进  

③改进了牧区的围栏建设       ④畜牧业产品大多在本地销售

下表是我国北纬35°-40°之间大陆上四地的气候资料，据表回答以下问题。