题目内容：

    Robots will have taken over most jobs within 30 years leaving humanity facing its “biggest challenger ever” to find meaning in life when work is no longer necessary according to experts.

Professor Moshe Vardi, who works in Rice University, says that many middle-class professionals will be assisting the work of machines within the next few decades leaving workers more leisure（休闲）time than they have ever experienced and as a result, the rise of robots could lead to unemployment rate greater than 50 percent.

“We are approaching a time when machines will be able to do better than humans at almost any task,” said Vardi, “Robots are doing more and more jobs that people used to do. I believe that society needs to face question before it’s upon us. If machines can do almost any work humans can do, what will humans do? The question I want to put forward is, ‘Does the technology we are developing finally benefit mankind?’”

Prof. Vardi said existing robotic and artificial intelligence (AI) technologies were already getting rid of a growing number of middle-class jobs and that pace of advancement in the field is increasing.

But Prof. Vardi is not sure that a workforce of human like robots will be good for mankind. “A typical answer is that if machines will do all our work, we will be free to pursue leisure activities,” he said. “I do not find this a promising future, as I do not find the idea of leisure-only life appealing. I believe that work is essential to human well-being.” He added, “Humanity is about to face perhaps its greatest challenge ever, which is finding meaning in life. If machines can do all the work or even 50 percent of the jobs that we used to do, what will people do?”

1.According to the text, what is human’s “biggest challenge ever”?

A.The most challenging jobs.

B.Seeking the significance of life.

C.The rise of unemployment rates.

D.No necessary work for humanity.

2.What is Prof. Vardi concerned about?

A.Whether robotic and AI technologies are good for humans.

B.Whether robots can rule humans within 30 years.

C.The unemployment rate is increasing greatly.

D.The development of robots is rapid enough.

3.What does Prof. Vardi think of the leisure-only life?

A.Realistic and comfortable.

B.Unpleasant and unattractive.

C.Entertaining and pleasing.

D.Disgusting and annoying.

4.We can infer from the text that we ________ in the future.

A.will be in short of labor force

B.can have a surplus of products

C.have to face fierce competition

D.may lose the value of life