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
SenseTime builds a better AI-powered future through innovation
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The soul of Lingnan Guqin
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FAQs
What's New
SZ teen Huang Tsingz holds solo oil painting exhibition in Tokyo
Explore New Who Art Village
Osaka World Expo in My Eyes