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China became the biggest purchase of US crude oil in February, overtaking Canada, against the backdrop of OPEC's scaling back of its production.

China has adopted multiple technological approaches at the same time to fast-track the development of a vaccine for the new virus, he said, adding that the vaccine development in China is at a similar stage as international efforts.

China has launched 18 commodity options over the past three years, and the country has become the world's largest market for commodity derivatives.

China appreciated that Japan has been firmly standing with China from the very beginning and thanked the country for the support and help from the Japanese government and society, he said.

China has more than 10 million children and teens with autism and most rely on family, according to Xu Xiu, a leading expert in autism at the Children's Hospital of Fudan University.