单项选择题

23. Paragraph 2 __________ 　　24. Paragraph 3 __________ 　　25. Paragraph 4 __________ 　　26. Paragraph 5 __________ 　　A．Features and applications 　　B．Display and data connection 　　C．Online stores 　　D．Differences from iPhone 　　E．Business usage 　　F．Operating system 　　27. In April 2010 the iPad developed by Apple was __________． 　　28. The iPad will only run programs approved by Apple if not __________． 　　29. iPad applications enable the owner’s email accounts to be __________． 　　30. iPad usage in offices enables employee productivity to be __________． 　　A．distributed 　　B．personalized 　　C．modified 　　D．increased 　　E．browsed 　　F．released