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Hello, this is Six Minute English from BBC Learning English.
I'm Neil.
And I'm Rob.
From the bubonic plague to cholera and tuberculosis,
disease and pandemics have changed the way cities have been built.
For example, buildings in 19th century Paris were designed with large, high-up windows to allow plenty of sunlight.
They were supposed to stop the spread of tuberculosis.
Coronavirus has been no different.
In lockdown, cities from Rio to Barcelona were transformed as wildlife and birdsong replaced the noise of taxi horns and traffic.
And with no car pollution, you could even see the stars at night.
In this programme we'll be asking of cities after lockdown will ever be the same again, and if we want them to be.
We'll be hearing some ideas from different cities around the world.
And of course, we'll be learning some new vocabulary along the way.
One of the cities most affected by Covid-19 was Mumbai and India, but approximately how many people were affected.
What's the estimated population of Mumbai?
That's my quiz question for you today, Rob.
Is it A, 15 million people,
B, 20 million people, or C, 25 million people?