根据短文理解，选择正确答案。

    English words don't stay the same. People need new words for new ideas and new inventions. Different words come into use, or old words are used in a new way.

    English can be changed by borrowing words from other languages. The word “tomato” was borrowed from Mexico and “tea” came from China and so on. Now new space and science words are being borrowed from other countries, too. New words can be formed by adding two words together. “Countryside” and “earthquake” are made up of two parts. Sometimes new words are shorter forms of old words. The word “photo” was made from “photograph” by cutting off the end of the longer word. “Plane” was made by cutting off the front part of “airplane”. The names of people and products can become new words, too. Our “sandwich”  was named after a man called Sandwich and “sellotape”(透明胶带) was a name given by the company that first made the product.

小余和小乐为了探究并联电路中电流的关系，他们设计的电路如图甲所示．实验器材如下：规格不同的灯泡各一只、电压可调节的学生电源1个、电流表1个、开关1个、导线若干．

（1）在连接电路的过程中，开关应该处于____ 状态．

（2）电流表校正好后，用此电流表试触时，小余发现电流表的指针偏转如图乙所示，根据你的分析，原因是____ ．

（3）他们改进后，把电流表分别接入到电路中的 A、B、C 处，测出的电流如下表：

通过对上面数据的分析，可以得出的结论是：在并联电路中，____ ；在实验中可以通过改变____ 来改变 A、B、C处电流的大小，从而进行多次实验，这样做的目的是____ ．

最早出现以盈利为目的，面向普通人的专门化旅游服务的国家是（   ）