题目内容
（请给出正确答案）
[主观题]
What is the author's purpose in writing this passage？A．To remind people of the need of sus
What is the author's purpose in writing this passage？
A．To remind people of the need of sustainable development.
B．To suggest ways of ensuring sustainable food production.
C．To advance new criteria for measuring farming progress.
D．To urge people to rethink what sustainable agriculture is.
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