①具有浓厚的历史文化底蕴，承载着人伦孝悌的血脉亲情

②包含着生活中的民族风土人情，反映了民族团结和国家统一的愿望

③是民族历史文化成就的重要标志和人类社会发展的独特标识

④蕴藏丰富的文化内涵，是中华文化生生不息的见证

分式方程$\frac{1}{3x}$=$\frac{1}{2x}$+2的解为（　　）

设A，B，C是△ABC三个内角，且tanA，tanB是方程3x²－5x+1=0的两个实根，那么△ABC是（    ）

选词填空

You may think there is nothing but sand in the desert of the world, but it is not true. In the desert we can____ stones. We can see hills, too. There is a little rain in the ____  , but it is not____  for most plants.
　　The animals are ____ to the desert people in many ways. The desert people eat the meat and drink the milk of the animals. They use their skins to ____ shoes, water bags and even tents(帐篷). They use the camels(骆驼) for____  things.
The people of the desert have to keep ____  from places to place. They must always look for grass or desert plants for their animals. They usually live in the tents. When there is mo more food for their animals, they take down their tents, put them on the camels and move to ____ place. The desert people are very____ . No man in the desert would ever refuse to help the people in ____  and give them food and water