Tell jokes on New Year's Day.

The first class in the afternoon is history class, and the teacher speaks enthusiastically in class.

A classmate nicknamed "San Mao" fell asleep at his desk. The teacher was very angry and called Sanmao up.

The teacher asked, "What do you think Wang Anshi and Ouyang Xiu have in common?"

Sanmao blurted out, "They are all from the Song Dynasty."

The teacher then asked, "Tell me, what do they have in common with Emperor Taizong and Zhuge Liang?"

San Mao was stunned and replied, "They are all ancient people."

There was a burst of laughter in class, and the teacher made mistakes and just played them as games, which also enlivened the classroom atmosphere.

So he asked, "Do they have anything in common with Sun Yat-sen and Lu Xun?"

Sanmao thought for a moment and said, "All men."

The teacher then asked, "What if you add Li Qingzhao and Cixi?"

San Mao was anxious: "He and they are both from China."

The teacher smiled and asked, "Tell me again what Napoleon and Caesar have in common?"

"They are all emperors."

"What do they have in common with Darwin and Hitler?"

Sanmao replied that he had mastered the trick now. He proudly replied, "All foreigners."

The teacher asked again, "What do they have in common with these people I mentioned earlier?"

Three burrs in the end: "all people."

The teacher asked again, "As far as I know, among these people, Zhuge Liang keeps chickens, and Cixi and Caesar also keep dogs. Count all these animals. Do they have anything in common? "

When the teacher asked this question, Sanmao's head began to sweat: "This ... this ... they are all dead."

"Well, they are all dead." The teacher nodded his head.

Sanmao limped down and thought, is this the end of the problem?

Unexpectedly, the teacher said, "You stand up, and there is one last question-if they are still alive, can you find something in common?"

Sanmao was dumbfounded. He thought for five minutes before he said sadly, "If the time difference is not counted, they should all have had lunch."