A:at the first
B:first of all
C:in first
D:first at all
Sunday,June 1
Dear Tony,
Now we are having fun at Tian'anmen Square. The weather is fine. There are many people here. We'll visit the Bird's Nest and the Water Cube. In the evening,we'll have Beijing Duck. I love Beijing. I hope you will come to China soon.
Your friend,
Ben
Tony White__
78 Flower Road__
New York,CBE779D,USA
已知一元二次方程ax2+bx+c=0(a>0)的两个实数根x1,x2满足x1+x2=4和x1x2=3,那么二次函数ax2+bx+c(a>0)的图象有可能是( )