A、To boost the American business investment in India. B、To improve the political ties between the US and India. C、To solve envir

Barack Obama addressed a town hall-style meeting with young people in Delhi on the final day of his visit to India last year.
    "The US can become India’s best partner," Mr. Obama told a gathering of university students and activists.
    Speaking at a joint business forum in Delhi, Mr. Obama said there was " much untapped potential" in the US-Indian economic relationship.
    Some 2,000 people, mostly students and one of last year’s Nobel Peace Prize winners, Indian child rights activist Kailash Satyarthi, cheered wildly as Mr. Obama described relations between the two countries as the defining partnership of the 21st century, said the BBC in Delhi.
    The three-day tour had been aimed at boosting economic ties between the two major allies. The first day of his visit, Mr. Obama and Indian Prime Minister Narendra Modi announced a breakthrough on a pact that will allow US companies to supply India with civilian nuclear technology.
    The 2006 India-US nuclear deal had been held up for eight years amid US concerns over who would be liable for any nuclear accident. Mr. Singh, the deal’s architect, had told the parliament that it marked the "end of India’s decades-long isolation from the nuclear mainstream. "
    Now, a large insurance pool will be set up. without the need for any further legislation. The plan, according to reports, is to transfer the financial risk to insurers in the case of an accident.
    On Monday evening, both he and Mr. Modi hailed the bilateral progress, with the Indian leader saying a stronger relationship "will make this world a better place for all. "
    Mr. Obama said trade had grown by around 60% in the past few years which was a "win-win" situation.
    "We’re moving in the right direction," he said. "We all know that the US-India economic relationship is also defined by so much untapped potential. "
    Mr. Obama’s visit to India was shortened so he could pay a visit to Saudi Arabia and pay his respects following the death of King Abdullah. He and his wife, Michelle, didn’t visit the Taj Mahal.
    Questions 23 to 25 are based on the recording you have just heard.
    23.What did Mr. Obama say about the US-Indian economic relationship
    21.What was Obama’s three-day tour in India aimed at?
    25.In the case of a nuclear accident, who will probably pay?