语法填空

    July is coming. People all around the world are talking about their ____ (vacation). Parents would like ____ (help) their children relax. ____ (luck), they have two months off. Some people enjoy quiet life, so many of ____ (they) stay at home watching TV, using computers and so on. ____ some spend time differently. My pen pal Tony ____ blonde hair is a boy from the US. He says that ____ (America) like going to the countryside. Just like his big family, they often go to a farm. There, some can feed animals, some can play and ____ (other) can watch ____ nice sky and rivers. They can also taste delicious food. They are quite ____  (interest) in the life there.

科学研究发现，人在说谎时，心理与生理都会发生变化，而且最灵敏的反应则是皮肤的电流（皮电）会发生变化。公安人员所使用的“测谎仪”就是依据这种原理制成的。以上研究说明：人体是导体，人体的电阻是____ （填“固定的”或“可变的”）。

Hello. I'm Mark. I'm a boy.

作者写故都，却写到了“都市闲人”，对此分析不当的一项是（     ）