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Documents with facing pages exported as single pages can be shown as spreads in AcrobatPro or Acrobat Reader. You can set the default view in AcrobatPro via Document Properties and then save the PDF:
In AcrobatPro or Reader you can also set the view to spreads via View>Page Display>Two Page Scrolling
If you export the document as single pages, you can change the initial view in Acrobat the Two-Up (Cover Page), and it will display the same spreads as your document. In the CC2017, you can select this setting in the PDF export dialog.
You have to set up your document as facing pages in the size of a single cropped page.
If you want to create a spread with the first and the last page of your document, start the first page with a new section and start numbering with the last (should be an even) number, start another section on the second page with number 1.