题目

 ______has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem. A. Despite that      B. Despite of what      C. In spite of what       D. Though what 答案：C焦炭的燃烧值是3.0×J/kg，它的物理意义是________．完全燃烧20kg的焦炭，可以放出________J的热量．