question: What was the purpose of the fruit walls built by French and English farmers ?
answer: acted as thermal masses and accelerated ripening by keeping plants warm
turker_answer: The purpose of the fruit walls built by French and English farmers was to act as thermal masses and accelerated ripening by keeping plants warm .
rule-based: The purpose of the fruit walls built by French and English farmers was acted as thermal masses and accelerated ripening by keeping plants warm .