题目

— Why does she always ask you for help? — There is no one else ________, is there? A. who to turn                      B. she can turn toC. for whom to turn                 D. for her to turn 答案：B 解析: 略下列物质中，不属于合金的是    A．硬铝             B．水银           C．黄铜            D． 钢铁