1 g镁条在空气中完全燃烧，生成物的质量[ ]
A.等于1g
B.小于1g
C.大于1g
D.无法确定
答案：C
解方程x（x+1）=2时，要先把方程化为______；再选择适当的方法求解，得方程的两根为x1=______，x2=______．
---- I ________ your advice very much.
---- You are welcome. I hope it is ________ to you.
A．like; unhelpful
B．raise; unhopeful
C．appreciate; helpful
D．thank; hopeful
