题目

 Generally speaking , almost all the kids are ______about how everything around them works.   A. curious   B. careful   C. anxious   D. excited    答案：D质量相同的下列四种物质，完全分解后制得氧气最多的是（ ）A、H2O2 B、KMnO4 C、KClO3 D、H2O