单项选择题A ringing cell phone or an audience member browsing the Web on her laptop during a speech are examples of __________ in the speech communication process.A.channelB.messageC.interferenceD.feedback
单项选择题“周公吐哺、天下归心”勾勒了周公（ ）的形象。 A、礼贤下士 B、忠君爱国 C、艰苦朴素 D、仁爱贤能
