下列瓶中盛装的常见物质中，含有机物的是（    ）

仔细观察如图漫画《开窗户》，下列说法正确的是（    ）

①漫画反映了一些学生存在闭锁心理的现象 
②这位同学容易形成自我封闭、孤僻的性格

③父母应正确引导和帮助子女走出困境         
④这位同学应敞开心扉，积极交往

直接写出下面每组两个数的最小公倍数．

    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 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.

根据上面三个图表内容，选择正确答案。