题目

— Did Peter fix the computer himself?    — He _________, because he doesn’t know much about computers. A. has it fixed      B. had fixed it      C. had it fixed      D. would fix it 答案：C 如果—个人的食物有1/2来自绿色植物，1/4来自小型肉食动物，1/4来自羊肉。假如传递效率为10％，那么该人每增加1千克体重，约消耗植物A．10千克B．28千克C．100千克D．280千克