题目内容：

    You've heard the predictions from some of the brightest minds about AI’s influence. Tesla and SpaceX chief Elon Musk worries that AI is far more dangerous than nuclear weapons. The late scientist Stephen Hawking warned AI could serve as the “worst event in the history of our civilization” unless humanity is prepared for its possible risks.

But many experts, even those who are aware of such risks, have a more positive attitude, especially in health-care and possibly in education. That is one of the results from a new AI study released Monday by the Pew Research Center.

Pew canvassed the opinions of 979 experts over the summer, a group that included famous technologists, developers, innovators and business and policy leaders. The interviewed experts, some of whom chose to remain anonymous, were asked to join in the discussion of a serious and important question: "By 2030, do you think it is most likely that advancing AI and related technology systems will improve human capacities and control them?"

Nearly two-thirds experts predicted most of us will be mostly better off. But a third thought otherwise, and a majority of the experts expressed at least some concerns over the long-term impact of AI on the "essential elements(要素) of being human." Among those concerns were data abuse, loss of jobs and loss of control brought by autonomous weapons and cybercrime(网络犯罪). Above all, by taking data in and spitting answers out, those "black box" tools make decisions in digital systems. It is an erosion(侵蚀) in our ability to think for ourselves.

1.What is the purpose of the author in writing this passage?

A. To stop human developing AI. B. To inform readers how AI develops.

C. To tell readers the result of a study. D. To encourage a public discussion.

2.What does the underlined word “canvass” in Paragraph 3 mean?

A. Ask. B. Adopt.

C. Weigh. D. Analyse.

3.What are experts most concerned about?

A. AI will beat humans in abilities and qualities.

B. Humans will suffer a decrease of thinking ability.

C. Humans will develop autonomous weapons.

D. AI will come to power in human societies.

4.What do we know about AI from the text?

A. Elon Musk holds a positive attitude towards AI.

B. Stephen Hawking warned people not to develop AI.

C. Few interviewed experts expressed their concerns about AI.

D. Most interviewed experts believed AI makes human life better.