题目

在绝大多数生物中，遗传信息传递的顺序是 ①蛋白质         ②DNA           ③mRNA           ④tRNA A．①→②→③      B．①→④→②      C．②→③→①           D．②→④→① 答案：CSome companies are thinking of ways to save natural _____ by making better use of the water used in the bathroom. A. resources            B. sources               C. power           D. energy