第21题: [单项选择]Practically all species of animals communicate either through sounds or through soundless codes. A. Simultaneously B. Almost C. Absolutely D. Basically 参考答案:B 答案解析:此句中的practically和almost同义,意为“几乎、差不多”;simultaneously:同时地;absolutely:完全地、绝对地;basically:基本上、主要地。