题目

Martin was so busy __________ the old that he gave up his part-time job. A) helping                     B) helped                      C) to help                    D) help 答案：A已知葡萄糖（C6H12O6）的燃烧热是2804kJ?mol-1，当它被氧化生成1mol水时放出的热量是（　　） A、26.0kJB、51.9kJC、155.8kJD、467.3kJ