单选题 Which of the following consists of three words that refer exactly to the same thing in the passage?
【正确答案】 D
【答案解析】文章第一自然段提到,地球上平均每人可拥有3/4吨的termites,these critters可有助于改变气候,影响人类生活,可见critters即termites,指同一物,文章始终在谈termites(白蚁),由此可以推出insects也指termites。故答案为D。