first example of AI-produced artwork, as AI has already been used to write poems and compose songs. However, many people doubt whether it should be called art at all.

According to Russian writer Leo Tolstroy (1828 - 1910), art is about creating emotion (情感). It's "a means of ... joining people together in the same feelings", he once said.

So, if the emotion behind art is what makes it, the ability to create and use tools is what makes human beings different from other species. And as a tool itself, the AI technology used to create the portrait is the result of a lot of effort made by several designers. Together, they "fed" the AI a huge collection of paintings from the 14th to the 18th centuries, until it was able to work out how to make similar paintings of its own.

The introduction of AI art could be the beginning of a new artistic movement. However, not everyone is ready to welcome these high-tech artists just yet.

"The human mind is what's behind the AI technology. And the human mind is not a cold, hard fact," said Oscar Schwartz, a professor of AI. "Rather, it is something that's created with our opinions and something that changes over time."

28. Why does the author mention the artists in Paragraph 1?

A. To introduce their works. B. To make an advertisement.

C. To present a piece of news. D. To focus the topic on the AI.

29. What does the underlined word "grotesque" in Paragraph 3 mean?

A. Strange. B. Simple. C. Messy. D. Understandable.

30. What can we learn about the AI-produced artwork according to Paragraph 5?

A. It comes from human works.

B. It shows human ability to create.

C. It expresses human feelings effectively.

D. It is beyond the imagination of humans.

31. Compared with the AI, Oscar Schwartz thinks human mind is .

A. limited B. decisive C. changeable D. meaningful

A team of engineers at Harvard University is trying to create the first robotic fly. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.

"The added difficulty with a project like this is that actually none of its components is off the shelf and so we have to develop them all on our own," said Robert Wood, a Harvard engineering professor.

They engineered a series of systems to start and drive the robotic fly. "The seemingly simple system which just moves the wings has a number of interdependencies（相互依赖）on the individual components, each of which individually has to perform well, but then has to be matched well to everything it's connected to," said Wood.

While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform