已知函数f（x）=x2+2x(x≥0)g(x)(x＜0)为奇函数，则f（g（-1

Do you think that the bridge ______ in a year? [ ]

A. would be completed

B. will be completed  

C. had been completed  

D. is being completed

已知点P在定圆O的圆内或圆周上,动圆C过点P与定圆O相切,则动圆C的圆心轨迹可能是(　　)

A．圆或椭圆或双曲线

B．两条射线或圆或抛物线

C．两条射线或圆或椭圆

D．椭圆或双曲线或抛物线

因式分解：x²﹣9y²=　   　．

最早提出管理具体职能的是（）。

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