1, A: The author compares history to a river. The three dynasties in Thailand have a history of 800 years, and the order is Sukhothai Dynasty-Dacheng Dynasty-Bangkok Dynasty. The order of my trip is Bangkok-Ayutthaya-Sukhothai, so it is called "upstream".

2. A: The rulers were corrupt and incompetent, and their national strength declined greatly, which led to foreign invasion and the country's demise.

3. a:

The second paragraph: Describe the broken walls, columns and walkways. This paper mainly introduces laterite and stone with local characteristics. Use "hornet's nest" as a metaphor for stone shape, "red with black rust spots" as a metaphor for stone color, and "from thin to hard, like cement" as a metaphor for stone color.

The third paragraph: describe the past prosperity in three sentences through imagination, which is in sharp contrast with the present "ruins". Pave the way for the following discussion.

The fourth paragraph: write "winding river" Focus on the restoration of the ancient city of Thailand in the past 30 years. It shows that Thailand cherishes the historical sites of its own nation and spares no expense to reproduce the grand occasion of that year.

The fifth paragraph: the collapsed ancient city is full of weeds and vines, but judging from the position of the city wall, the city river and the four gates, the ancient city is heavily guarded, magnificent and admirable. )