题目

I strongly believe that it is rather important to be a good listener. And although I have become a better listener than I was ten years ago, I have to admit I’m still only a(n) ___51___ listener. Effective listening is more than simply ___52___ the bad habit of interrupting others while they are speaking or finishing their sentences. It’s being ___53___  listening to the entire thought of someone ___54___  waiting impatiently for your chance to respond. In some ways, the way we fail to listen is symbolic of the way we live. We often treat communication as if it were a ___55___. I当一只蚜虫受到攻击时，就会放出一种有告警作用的化学物质，从而使邻近的蚜虫迅速逃避敌害，这种现象生物学上称为（   ） A．种间互助         B．种内互助         C．共生             D．竞争