Find the topic sentence of the following paragraph. ( )A:The Irish countryside is very beautiful. B:There is a popular Irish song which says that there are 100 different shades of green in the Irish landscape, and this is no exaggeration. C:Thanks to general rainfall, much of the countryside is covered in rich green vegetation, which is why Ireland is also known as the Emerald Isle. D:It also has a varied landscape with dramatic mountains, rocky coastlines and rolling hills. E:Thus, Ireland is one of the most appealing places for the tourists. 答案: The Irish countryside is very beautiful. 第三章 单元测试