题目

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。Ecotourism is commonly regarded as low impact(影响)travel to undisturbed places. It is different from traditional tourism because it allows the traveler to become 【1】 (educate)about the areas - both in terms of geographical conditions and cultural characteristics, and often provides money for conservation and benefits the 【2】(develop)of the local areas. Ecotourism has 【3】(it)origin with the environmental movement of the 1970s. It was not widely accepted as a travel concept 【4】 the la在一个电路中有两个完全相同的用电器．用电流表测量时，发现通过每个用电器的电流都相等，则这两个用电器的连接（　　）A．一定串联B．一定并联C．可能串联D．一定不是并联