题目

（2011贵州六盘水，11，4分）如果上升10米记作＋10米，那么下降5米记作_______米．  答案：－5解析:略 If you don't know how to spell new words , ______ in the dictionary.       [     ]A. look up them     B. look for them     C. look them up      D. look them for