下列哪些国外的图库网站是免费的？A:https://gratisography.com/ B:https://www.500px.com C:https://pixabay.com D:https://www.pexels.com 答案:

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下列哪些国外的图库网站是免费的？A:https://gratisography.com/ B:https://www.500px.com C:https://pixabay.com D:https://www.pexels.com 答案: https://gratisography.com/;https://pixabay.com;https://www.pexels.com