We have a busy week. From Monday to F ____   , my parents and I are busy. We get up at six in the morning. We often have b  ____    at six thirty. I often have some bread and milk. Then my parents go to work by car and I go to school on f ____   . Our morning classes b ____    at eight. We have Chinese, Maths and E  ____   every day. We also have Science, PE, Art and Music lessons. At school, I have l  ____   of friends. We often talk to each other after class.

   I come b  ____    home from school at five in the afternoon. My parents often get home at five thirty. After dinner, they usually w  ____    clothes and I do homework. I don’t go to school on Saturday or Sunday. O  ____    Saturday evening, I like to w  ____   emails to my friends. My parents often watch TV.

人体内的小肠是主要的____和____器官．

图为我国四大工业基地分布图，读图，回答下面小题。

如图装置为某学生在科技创新大赛时发明的可以直接测量液体密度的“密度天平”.其制作过程和原理如下：选择一根长1米的杠杆，调节两边螺母使杠杆在水平位置平衡，在左侧离中点10 厘米的A 位置用细线固定一个质量为150克、容积为80毫升的容器。右侧用细线悬挂一质量为50 克的钩码（细线的质量忽略不计）。测量时往容器中加满待测液体，移动钩码使杠杆在水平位置平衡，在钩码悬挂位置直接读出液体的密度。