2015年1月20日,习近平在洱海边察看生态保护湿地时强调,经济要发展,但不能以破坏生态环境为代价。生态环境保护是一个长期任务,要久久为功。一定要把洱海保护好,让“苍山不墨千秋画,洱海无弦万古琴”的自然美景永驻人间。下面最能体现该论断所蕴涵哲理的选项是( )
Although the causes of cancer_____, we do not yet have any practical way to prevent it.
With just four years _______, the Brazil Olympic organizers have promised to deliver an equally inspirational ceremony.
We are so sorry for that.We'll try to determine exactly _________ went wrong that evening.
If you go there by ____train ,you can have quite a comfortable journey ,but make sure you get ___fast one.
Visitors were _____at the _____pictures that the guide showed.