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 diet for people the world over.
（本题出自2022年12月四级真题卷二）
答案&解析：
49.A)
【精析】推理判断题。定位段提到，这种向水产养殖的转变对于确保食品安全性和可持续性至关重要。到2050年，全球将需要养活大约97亿人。他们需要从某些地方获取蛋白质。随后用牛和鲤鱼的例子来说明，养鱼比养牛更划算。结合段落大意可以推断出，发展水产养殖对于养活迅速增长的人口更有利，故答案为A)。
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