【简答题】某学习小组对以下动物进行了调查和分类研究,请帮助他们完成下列问题:(12分) A. 海马 B. 猕猴 C. 蚯蚓 D. 蝗虫 E. 家鸽 F. 青蛙 (1)学习小组将上述生物分为A、B、E、F和C、D两类,其分类的主要依据是______________________________。 (2)学习小组同学调查到海马有以下特征:身体侧扁,全身无鳞,有脊柱,在水中能以直立...
【简答题】Mr. Brown is a very old man. Every morning he goes for a walk in the park. And he comes home at 12:30 for his lunch. But today a police car stops at his house at twelve o’clock. Two policemen help him...