题目

A small boy at summer camp received a large package of cookies (饼干) in the mail from his mother. He ate a few, and then ______ the rest under his bed. The next day, after lunch, he went to his tent to get a cookie. The box was ______.That afternoon a camp teacher, who had been ______ of the theft (失窃), saw another boy sitting behind a tree eating the stolen ______. “That young man,” he said to himself, “must be taught not to ______.”He returned to the group and met the boy ______ cookies had been stolen. Billy, he said, “I know who stole your cookies. Will you ______ me teach目前人类认为钚（94Pu）是最毒的元素，其一种原子的中子数是质子数的1.596倍。该原子的质量数为                        A．94                        B．150                     C．244.024                  D．244