Why can t sweet potatoes become a staple food, and why?

Because the Tang Dynasty was a prosperous era. In the era of Chengping, there were often no great sparks of thought, on the contrary, in the era of war and chaos in the Spring and Autumn Period and the Warring States Period, ideology and culture were particularly developed. Because ideas are often born out of sharp reflections on social reality. >>>More

If you love it deeply, you can be friends with it, because you still love it deeply, as long as it can be happy! >>>More

Because this relationship was not based on reality at the beginning, how realistic people are now, no matter how well it is said on the Internet, it can't withstand a little storm in reality.

Look at the building, if you were a couple before, don't be friends, in the face of the future, you each find someone you like, two people will feel very embarrassed to be together, looking at the person you once liked and others together, it will be very sad, if it is hurt by friends, then there is room to be friends, because the friendship between friends is getting purer and purer, and it depends on two handles to hold it firmly.

The first reason is that table tennis is too poor to watch. It is two people or four people playing around in a fixed place, it is difficult to attract many spectators, and it is naturally difficult to form an income from watching football. In fact, if you look carefully, there is really no consumer market for table tennis, and the attendance rate of many games is very low, and even if you come to some views, then you can see that the whole school or a certain institution or a state-owned enterprise is the whole family, and if you think about it, you will know that it is to send tickets or cheap tickets to buy the audience to get seats. >>>More