下图为探究CO₂是否为植物光合作用原料的实验装置示意图。相关叙述正确的是（   ）

与春秋后期越王勾践称霸有密切关系的成语典故是 （  ）

    In this region of Yunnan, the Naxi people make up the ____(major) of the population. Many tourists visit the region these days____ (hear) of the fascinating culture of the Naxi, and other ethnic groups. It's impossible not to fall____the city of Lijiang, with its beautiful snow-covered mountain peak, and____(it) maze of cobbled streets. Some tourists have been lucky____ to be put up by friendly Naxi people, so if someone offers you____(accommodate), think it over____you book into a guesthouse. Being part of a family is a good approach to____(learn) about another culture. Exploring the old city is ____good experience. You may think you will get lost in the tiny streets, but don't let this stop you! Just go down them and it's likely that you will come across something wonderful____will be unforgettable.