Some of my acquaintances in the country come up to town once or twice a year to visit the theatre as a special treat. For them this is a major operation which involves considerable planning. As the play draws to its close, they wonder whether they will ever catch that last train home. The cit dweller never experiences anxieties of this sort. The latest exhibitions, films, or plays are only a short bus ride away. Shopping, too, is always a pleasure. The latest exhibitions, films, or plays are only a short bus ride away. Shopping, too, is always a pleasure. There is so much variety that you never have to make do with second best. Country people run wild when they go shopping in the city and stagger home loaded with as many of the exotic items as they can carry. Nor is the city without its moments of beauty. There is something comforting about the warm glow shed by advertisements on cold wet winter nights. Few things could be more impressive than the peace that descends on deserted city streets at weekends when the thousands that travel to work every day are tucked away in their homes in the country. It has always been a mystery to me why city dwellers, who appreciate all these things, obstinately pretend that they would prefer to live in the country.

请教专家老师：

1)这一句...Nor is the city without its moments of beauty. 只有前面出现了一个否定的句子，然后，后面才可以用nor...可是本文中，前面并没有先出现一个否定含义的句子呀？为什么这里可以单独使用nor从句呢？

2) are tucked away...不能理解为什么要使用被动态？人不是主动躲藏起来的吗？为什么人会是被动躲藏起来的呢？

谢谢专家老师！