题目

已知x=2是一元二次方程x2﹣mx﹣10=0的一个根，则m等于（ ）.A. ﹣3 B. -5 C. 3 D. 5 答案：【答案】A【解析】根据一元二次方程的解的定义即可求出答案．将x=2代入x2-mx-10=0，∴4-2m-10=0∴m=-3故选A．I smell something ____ in the kitchen. Can I call you back in a minute? [     ]A. burning B. burnt C. being burnt D. to be burnt