Textbooks may take the form of （ ）

A、printedmaterialssuchasbooks,workbooks,worksheets,orreaders;
B、non-printmaterialssuchasaudiomaterials,videos,orcomputer-basedmaterials
C、materialsthatcomprisebothprintandnon-printsourcessuchasself-accessmaterialsandmaterialsontheInternet.
D、magazines,newspapers,andTVmaterials,mayalsoplayaroleinthecurriculum.