SB - Ex 4 - 1/ A city with one thousand people is a megacity.
F - A city with more than ten million people is a megacity.
SB - Ex 4 - 2/ In 2017, there were sixteen megacities in China.
F - In 2017, there were sixteen megacities in the world. Six of them were in China.
SB - Ex 4 - 3/ They are building a lot of skyscrapers in China these days.
T