为探究生长调节物质CFM对IAA的极性运输是否有抑制作用,取豌豆幼苗茎切段进行对照实验,实验组设计如图所示,下列叙述错误的是() A. 实验组豌豆幼苗茎切段形态学上端朝上,对照组豌豆幼苗茎切段形态学上端朝下 B. 对照组羊毛脂中不含CFM C. 用放射性同位素标记IAA作为测试指标羊毛脂 D. 若受体中IAA含量与对照组相比明显低,则说明CFM对极性运输有抑制作用If you ________ Beijing Duck,I'd like to treat you to a meal at a famous duck restaurant.A.didn't tryB.don't tryC.haven't triedD.hadn't tried