18．D 细节理解题。从文章第二段His poems expressed his dissatisfaction with the government and his great pity for the common people.一句可知。
19．A 细节理解题。 从文章最后一句After his death, the people of Chengdu built a shrine on the site of his garden to honor him，…可直接得出答案。
20．C 主旨大意题。文章开篇点明了文章的主题Du Fu(712～770) was one of the greatest poets in the Tang Dynasty.也就是说这是文章的中心句，文章其他部分都是围绕该句展开的。由此可以判断，C项最能概括全文。
