【正确答案】The lecture is about a behavior known as passive-aggressive conduct, and the professor gives an example from his own life.
Nearly a year ago, his favorite sister failed to come to his birthday party. She had a reason for not coming, and the professor said he understood. But in his heart, he was angry. Later, his sister wanted him to come to dinner. He deliberately came late and felt good that he spoiled her evening. The professor's example is typical of passive- aggression.

【答案解析】[听力原文]
M: Passive-aggression behavior sounds awful, doesn't it? But I think most of us have been-or are—passive-aggressive, at least sometimes. Now let me give an example from my own life.
About a year ago, it was my birthday. I had a get-together planned at my house just for a few friends and relatives. Well, my favorite sister said she couldn't come over because she is a doctor, and there was an emergency. So, I told her I understood. But, yeah, deep down I was angry. I knew it was wrong, but I felt really hurt. So some time later, my sister asked me to have dinner. I went to the dinner. But I made sure I was more than an hour late. My sister looked like she wanted to cry. I could see I had pretty well spoiled her evening. And all I could think was, "So, now she knows how I felt!" You know what? Doing that felt pretty good, even though it's terrible to have to admit it. That is a classic example of passive-aggressive behavior. I was resentful and I got revenge simply by fulfilling a promise too slowly.

Alternative Wording(替换表达)
Synonyms (a)a reason—an excuse, an alibi (b)in his heart—deep down
(c)deliberately—on purpose
Paraphrases 1. She offered an excuse; he claimed to accept her alibi.
2. He came late on purpose.