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
SZ robot stars at China Pavilion
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Relax, let your robotic therapist do the work
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FAQs
What's New
SZ to present tech-culture grandeur at National Games closing ceremonies
Smile today!
Osaka World Expo in My Eyes