People practice social distancing as they wait outside a supermarket in Arlington, Virginia, the United States, April 4, 2020. (Photos: Xinhua)

Photo taken on April 7, 2020 shows signs reminding people of social distancing at a supermarket in Arlington, Virginia, the United States.

People practice social distancing as they wait outside a supermarket in Arlington, Virginia, the United States, April 4, 2020.

Photo taken on April 7, 2020 shows signs reminding people of social distancing at a supermarket in Arlington, Virginia, the United States.

Photo taken on April 7, 2020 shows signs reminding people of social distancing at a supermarket in Arlington, Virginia, the United States.

People practice social distancing as they wait outside a supermarket in Arlington, Virginia, the United States, April 4, 2020.

People practice social distancing as they wait outside a supermarket in Arlington, Virginia, the United States, April 4, 2020.

People practice social distancing as they wait outside a supermarket in Washington, the United States, April 3, 2020.

People practice social distancing as they wait outside a supermarket in Arlington, Virginia, the United States, April 4, 2020.