读下图，回答下列问题。
（1）写出我国四大地理区域的名称：
A_____________；B______________；C______________；D_____________
（2）地理区域 A、B的分界线是_______________________。
（3）用字母标注出北方地区的标志性地理事物及主要地形区：
a渤海c东北平原b黄海d华北平原e黄土高原
（4）用字母标注出南方地区的标志性地理事物及主要地形区：
f东海g南海h四川盆地i长江中下游平原j云贵高原k东南丘陵
（1）北方地区；南方地区；西北地区；青藏地区
（2）秦岭一淮河一线
（3）“略”
（4）“略”
 Look at the paper in the picture carefully. Is there anything different from your notebook paper? This kind of paper feels as soft as your notebook paper. It’s also easy to write on. But do you know, this kind of paper is made from stone?As we know, stone is easy to get on the earth, so it’s cheap. And the stone paper is about 20% to 30% cheaper than ordinary paper. The stone paper causes little pollution and helps protect the environment, because it makes tree and water free. The following table shows what is needed to make one ton of stone paper and one ton of ordinary paper.
Now in Beijing, some students begin to use stone paper to do their homework. And during the two sessions (两会) in 2011, stone paper was also used. 小题1:Stone paper is ______________.
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