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。One of the best things about a photographer is that you can observe animals in their 【1】 (nature) environment. I really enjoy working outside in the wild. I like to take photos in Yellowstone National Park best. Being famous【2】the variety of its wildlife, it is probably best known for its bears, 【3】 can run very fast and also swim perfectly.Last spring, after stepping out of a dark forest, I was 【4】(shock) to see the breathtaking view. While I was concentrating on photographing the ama下图是神经元模式图，根据图回答下列问题。 （1）写出下列标号的结构名称。 ①________③________⑤________ ⑥________⑦________⑧________ （2）图中的⑤主要集中在脑和脊髓中，色泽________，叫做________。 （3）图中的⑥或长的①及套在外面的髓鞘叫________，如分布在脑和脊髓中，色泽________，叫做________，若许多聚集成束，外面包着结缔组织膜，就成为一条________。