题目内容：

    For the last month, a married couple has been interacting with a robot — called an Avatar — （hat’s con trolled by their daughter hundreds of miles away. Made by ANA Holdings Inc, it looks like a vacuum cleaner with an iPad attached. But the screen displays the daughter’s face as they chat, and its wheels let her walk slowly about the house as though she’s really there.

“Virtual travel” is nothing new, of course. Storytellers, travel writers and artists have been stimulating the senses of armchair tourists for centuries. It’s only in recent decades that frequent, safe travel has become available to the non-wealthy.

Yet even as the world’s middle classes climb out of the armchair and into economy-class seats, there are signs of a post-travel society appearing. Concerns about the environment make people lose interest in carbon-intensive (碳排放量很高的) airlines. And the aging of societies is both slowing down the growth of physical travel and creating demand for alternative ways to experience the world. For the travel industry, virtual reality offers a tantalizing (诱人的) response to these trends.

Of course, far-out (前卫的) technologies encourage profits. ANA doesn’t plan to start selling Avatars until next year. By one estimate, the global market for this kind of technology will be worth only about S300 million by 2023. By contrast, ANA’s traditional travel business brought in more than $19 billion last year.

But although the business case for virtual vacations is still weak, the market for technologies that bridge physical distances between families and coworkers seems likely to only expand. ANA’s robots may not replace its airplanes any time soon, but they’ll almost certainly be a part of travel’s high-tech future.

1.What purpose does the first paragraph serve in the passage?

A.To show a picture of our future life.

B.To describe the daily life of a couple.

C.To attract readers’ attention to the topic.

D.To add background in formation of the topic.

2.What is the third paragraph mainly about?

A.Humans tend to live much longer than before.

B.People are becoming more worried about the environment.

C.Virtual travel might cater for people’s desire to see the world.

D.The profits of carbon-intensive airlines are possibly declining.

3.ANA is not planning to start selling Avatars soon probably because ________.

A.it is still skeptical about their potential

B.they still need to be further tested out

C.traditional travel business is taking off

D.their commercial profits may not be satisfying

4.The author believes the global market for virtual travel is ________.

A.promising B.ambiguous

C.depressing D.challenging