21. C细节理解题。根据文章第二段第二句James Brindley is recognized as one of the leading early canal engineers.所对应的日期November 7th.。故选C。
22. D 细节理解题。根据文章第四段February 6th中的第一句An Update on the Cotsword Canals, by Liz Payne. The Stroudwater Canal is moving towards reopening.可以得出答案。故选D。
23. A 细节理解题。根据文章第五段第一句Eyots and Aits- Thames Islands, by Miranda Vickers.可以知道做报告的人是Mirands Vickets。故选A。
考点：广告布告类短文阅读
