The excavation was carried out in an area of about 1,200 square meters in an ancient tomb site; hundreds of antiques and samples of ceramics were found.
The family felt safe carrying their 4-year-old son out of the house after the city conducted nucleic acid testing of all residents in June. They took him to the water park as temperatures rose in July, she said.
The extent of the injuries of the other three, believed to be a nursery school teacher and the male driver of the minivan, were not immediately known, police and firefighters said.
The event will continue through Friday, according to Zhang.
The expo, which kicked off Wednesday in Ningxia's capital Yinchuan and will run until Saturday, is sponsored by the Ministry of Commerce, the China Council for the Promotion of International Trade and the regional government of Ningxia.
The fair is important for all toy manufacturers, but especially for those in China. They produce about 85 percent of the toys sold in the United States annually and 75 percent globally.
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The expo, he said, represents China's sincere desire to open its market to the world and promote more balanced development of China's external trade, and it shows China's commitment in undertaking the responsibility of pushing forward global economic growth.
The event, using the example of the CPC Yunnan provincial committee since 2012, attracted about 400 diplomats, foreign politicians and representatives of international organizations on Thursday.
The executive also highlighted that the company has no plans to spin off or sell businesses in the future, though the US government's ban will force it to scale back production.
The farm will introduce crop varieties, and use farming equipment and techniques as well as management experience from Iowa, according to Ye Changqing, executive deputy head of the Hebei People's Association for Friendship with Foreign Countries.