I like to study in a group because of following reasons.To begin with,different students have divetse ideas,we can combine our ideas and get the correct answer faster.What’more,I can learn more from other excellent students,which can improve my ability of study.Last but not least,I can have more inspiring thought when study in a group.A proverb said that Many heads are better than one.So I like to study in a group instead of on my own.If I study on my own,I can not do better when I have some questions but noboby discusses with me.To sum up,I like to study in a group rather than studying on my own.

1 能辨别面额的污损人民币， 可向金融机构按原面额全额兑换。
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3 虽然是能辨别面额，票面剩余四分之三(含四分之三)以上，图案、文字能按原样连接的残缺、污损的人民币，但是因为兑付额不足一分的，所以不予兑换
4 是能辨别面额，票面剩余二分之一(含二分之一)至四分之三以下，其图案、文字能按原样连接的残缺的人民币，金融机构应向持有人按原面额的一半兑换。因而可以向金融机构兑换50元。
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6 该币不能辨别面额，票面没有剩余二分之一(含二分之一)至四分之三以下，因此无法向金融机构兑换。无法流通，由中国人民银行回收该残缺人民币。
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8 能辨别面额，票面剩余二分之一(含二分之一)至四分之三以下， 纸币呈正十字形缺少四分之一的， 其图案、文字能按原样连接的残缺、污损人民币，可向金融机构按原面额的一半兑换。兑换50元。

As we can see from the curve graph, the global water consumption for different sectors, namely the agricultural, industrial and domestic sectors, from 1900 to 2000.
To be more specific, water used in the agricultural region went up rapidly in 1900 to 2000. Simultaneously, water consumption in the other two sectors also assumed a rising trend. Industrial and domestic spending of water was one of the reason why water consumption rising. Industrial and domestic water uses rose steadily to over 1000 km³ and 500 km³ respectively.
The diagram shows differences in water consumption between Brazil and Congo. Congo's land is dramatically smaller than the area of irrigated land of 26500 km² in Brazil at merely 100 km². Spontaneously, this means that a high proportion of water is used for agricultural purposes in both countries, and the inference is also supported by the figures for water consumption per person:359 m³ in Brazil and, on the contrary, only 8 m³ in Congo.
To sum up, agricultural usage of water is the largest among all sectors worldwide. A country which has more irrigated land generally requires more water.