Q:I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "During this period, the island enjoyed increased revenues through the sale of flax, with prices peaking in 1951. However, the industry declined because of transportation costs and competition from synthetic fibres. The decision by the British Post Office to use synthetic fibres for its mailbags was a further blow, contributing to the closure of the island's flax mills in 1965."?
A:
Regarding the place that grinds organic materials into smaller pieces, what is unlikely to be used as a starting material?