多选题 Knowing the reward of ______, NASA astronaut Ellen Ochoa encourages students to study hard if they wish to pursue career in science and engineering.
【正确答案】 C、E
【答案解析】[解析] ● 逗号表示同义重复。
● 空格和study hard取同。generosity大方，serendipity意外，diligence勤奋，largesse大方，industry勤奋，merriment欢笑。答案选CE。