Final answer:
The portrait of Mao Zedong hanging over Tiananmen has not been up constantly since it was first hung.
Step-by-step explanation:
The statement that the portrait of Mao Zedong hanging over Tiananmen has never been taken down since the day it was first hung is False. There have been instances where the portrait has been taken down, such as during renovations. Additionally, it is important to note that the mention of a portrait of Mao Zedong hanging over Tiananmen Square could be referring to an image or a painting rather than a physical portrait.