把50克盐放入200克水中，这时盐和水的重量比是1：4．______．

踢毽子。

男孩踢18个，女孩踢的和他差不多，女孩踢[ ]

A.36个

B.17个

C.7个

社会服务机构开展活动过程中，机构董事会、高层管理者必须关心的问题是( )。

A．如何设置合理的机构

B．如何获得活动经费

C．如何健全内部控制制度

D．如何培养专业的工作人员

I will never forget the lesson about my window. Four years ago, I moved to a house in a large town. One of my new neighbors’ house was only a few feet away from mine. There lived a woman. Through one of my windows, I could see her reading by her window every afternoon.

Several months later, I found I couldn’t see the woman clearly. I thought her window was too dirty. I said to myself, “Why doesn’t she clean her window? It looks terrible!”

One afternoon, I decided to clean my house including the window. I felt tired after three hours of hard work. So I sat down by the window for a rest. What a surprise! I could see the woman reading there clearly again! By that time, I realized that my own window was too dirty, not hers! I really felt ashamed for myself. I had been watching her through my dirty window in the past days!

The experience is very important for me. So I try to clean the window of my heart before judging others.

小题1:How long has the writer lived in the house according to the passage?

A．One years

B．Two years.

C．Three years.

D．Four years.小题2:What did the woman do every afternoon?

A．Read by her window.

B．played tennis on the grass.

C．Danced in her house.

D．sang in front of the house.小题3:The writer couldn’t see the woman clearly because ______________.

A．the writer’s window was dirty

B．the woman’s house was too far

C．the woman didn’t open her window

D．there was something wrong with his eyes.小题4:The underlined word “ashamed” means _________________.

A．高兴的

B．放松的

C．羞愧的

D．自豪的小题5: According to the passage, the writer has learnt how to __________________.

A．clean the house

B．judge others

C．help neighbors

D．learn English

人不惑之年是指50岁。（）

下图甲是利用人工湿地净化生活污水（主要含有机物）的原理简图。科研人员为有效控制该湿地生态系统中的某种害虫，引入了该害虫的天敌，并用一段时间的调查数据构建了图乙和图丙所示的模型（图乙中箭头方向代表曲线变化趋势）。请据图回答：

输入该人工湿地的能量来源有（）。