Beinao No.1 is a smart machine. It is made by Chinese scientists. It can read signals from the brain. By March 2026, doctors had put it in 7 patients’ bodies. It works safely for more than 45,000 hours. It is safe and helpful for patients.

A young man from Beijing was about 30 years old. A bad car accident hurt his neck. He could not move his arms or legs. Doctors thought he would never walk or use his hands again. Luckily, doctors used Beinao No.1 to help him.

In February 2025, doctors put Beinao No.1 into his body. A few days after the operation, he he could control a robot arm with his mind. He could pour water and drink water. A few weeks later, he could use his mind to play computer games.

1. 3.What does the underlined word “operation” mean in the passage?（词义猜测）

A    游戏.

B    手术.

C    课程.

D    测试.