下图内容记载的科技成就是（    ）

- How long does it take to get to the airport?

- Forty minutes. But it's foggy today. I'm not sure _________ the highway will be closed soon. Let's set off earlier.

“春江潮水连海平，海上明月共潮生。滟滟随波千万里，何处春江无月明。”奥运会开幕式上，随着这四句昆曲唱词拉开了礼乐篇章。昆曲在明代曾辉煌一时，但不久便走向了衰落，主要原因是