Click on the question mark. choose the most reasonable inference
based on the text evidence and what you already know.
text evidence
what you already know
inference
" lenses were not
many people today wear
widely used until after the
contact lenses.
1940s. that's when companies
began manufacturing contact
lenses from plastic."
companies manufactured contact lenses from plastic because it was
much cheaper.
plastic was too hard for companies to find until after the 1940s.
plastic contact lenses have continued to be popular since the 1950s.
people only bought plastic contact lenses after their old ones broke or
got scratched