第21题: [单项选择]At first the ______ of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expense, it became a reality. A. transaction B. transmission C. transformation D. transition 参考答案:B 答案解析:[解析] 近形近义题。四个选项拼写形式非常相似，但意义差别很大。选项[A]“交易，业务”；选项[B]“播送，传播”，一般指传播图片、信息、数据等；选项[C]“转变，变革”，一般指内在的、彻底的变革；选
第22题: [单项选择]Most of the marine species living in the darkest depths have ______. A. learned to live without light B. evolved ingenious devices to help them C. found ways to supply their own light D. developed extremely sensitive eyes 参考答案:B 答案解析:第一段提到大多数海底深处的生物have evolved some extremely ingenious devices来寻找食物和发现敌人。
