A:①③
B:②④
C:②③
D:①④
由直线y=x+1上的点向圆(x-3)2+(y+2)2=1 引切线,则切线长的最小值为( )
①26.7+147.2=
②801.6-21.9=
③20-0.85=
④15.78+2.45=
验算:
⑤33.4-9.48=
⑥13.1+120.95=
⑦100-19.2=
Scott has _______ interesting job.