题目

All the students were eager to know what the future may have _____ for them when they graduated from the school. A. in store                   B. in common C. in all                     D. in particular 答案：A19、噬菌体侵染细菌实验中，标记噬菌体蛋白质分子应该选用的放射性元素为 A．C                               B．P                         C．S                           D．N