How do I get into these Shenzhen tourist attractions?

Are these attractions in Shenzhen free to visit?

Which Attractions in Shenzhen are best to visit during each of the four seasons?
Impressions
Shenzhen in Hues
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'Tech for People' Nanshan Day
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FAQs
What's New
Event brings together over 80 women from around the world
Mother's Day fun run supports autism community in Shenzhen
Make it Shenzhen