题目

The boy lay on his back, with his teeth______ ,his right hand_______ , and his glaring eyes _________straight upward. A. set, raising, looked             B. set, raised, looking C. setting, raised, looked         D. to set, raising, looking   答案：Bset, raised过去分作宾补;looking现在分词作宾补  （4分）在下列空格上填写适当的化学用语或化学用语表示的意义：（1）3CO2            ；（2）氢氧化镁          ；（3）3个碳酸根离子        ；（4）氧化铁中铁元素显+3价           。