单选题
One may assume from this article that
A、
pigs have remained unchanged for centuries
B、
pigs are naturally vicious animals
C、
pigs make a significant contribution to modem life
D、
pigs are better than any other animal for laboratory
【正确答案】
C
【答案解析】
解析：作者通篇都在为猪打抱不平，只有选项C能从文中合理地推断出来。
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