Educators who have turned to the open web understand open content is authored at a variety of reading levels with varying degrees of complexity. Collections that account for this include publishers like ReadWorks.org
"Take ReadWorks, which provides research-based materials to teachers to boost students’ reading comprehension. The nonprofit integrates educator knowledge by putting reading experts on its advisory board."
"[ReadWorks] draws a sharp distinction between fluency and reading comprehension. Further, they explain why understanding the difference is so important to identifying and solving student's reading challenges."
"Adding Narratively's superbly written articles to ReadWorks will provide K-8 students with engaging texts that will expand their knowledge while engaging their imaginations, as they build reading comprehension skills.”
“We have a reading crisis in this country, and some of that stems from the harsh truth that many elementary school teachers aren’t well equipped to teach reading. Rather than curse that darkness, ReadWorks offers help — tons of it. I urge you to share this website with every teacher you know. It’s free.”