以下事例能体现“舍小家，为大家”精神的有(　　)
①三峡移民②为街道整齐美观某单位拆掉副楼③有些住户在街道内存放杂物、自行车等④为单位集体利益偷税漏税

    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.

在下图中用涂色部分表示 $\frac{3}{4}$ 。

读“长江水系图”，回答问题．