题目

---Lucy, Miss Wang won’t teach_____ English next term. ---What a pity! She often helps us with ____ English. A. us; our         B. our ; us   C. us ; ours     D. our; our 答案：A写出下列四幅图所研究的物理规律．图-1研究______．图-2研究______．图-3研究______．图-4研究______．