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单选题
49. Why does the author say aquaculture is so important these days?
A
It is a must for feeding the world＇s fast-growing population.
B
It proves a reliable source of protein for humans and animals.
C
It is essential to maintaining both mental and physical health.
D
It ensures a balanced healthy dict for people the world over.
答案解析
正确答案：D
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