题目

 ----I need something for cutting the paper.  ----Oh, you want a knife? OK, I'll get ______ for you. A. it                             B. that                         C. this                          D. one 答案：D6、形成黄土高原地表千沟万壑景观的主要原因是                                                        （    ）        A．风力的沉积    B．流水的侵蚀      C．断裂作用        D．内力作用