题目

小金在野外观察到4株植物PQR和S，并设计如图所示的二歧分类检索表来分辨这些植物。若上述4株植物中有一株植物是桃树,则它是( ) A . P B . Q C . R D . S 答案：CHaving never met such a ______ situation, Mr. Green felt ______ and didn’t know what to do.A. confusing; confused B. confused; confusingC. confusing; confusing D. confused; confused