Your gut reaction (本能反應(yīng)) and dismissive rejection, even of a worthless idea, might not qualify as systematic or fair.
出自-2011年6月閱讀原文
It's not only the study of human population, but the populations of non-human species, including viruses like influenza, the bacteria in your gut, plants that you eat, animals that you enjoy or that provide you with meat.
2017年6月六級(jí)真題（第二套）聽力 Section C
Is it an enzyme produced by the worm itself or by its gut microbes?