要严格执行纪律，及时查处违纪问题，防止和纠正管理松懈、作风松散、纪律松弛的“三松”现象.
参考答案：对
_______________ of the students are girls in our class. [ ]
A. Two-three
B. Two-threes
C. Two-thirds
D. Second-three
抛物线y=x2+4x+9的对称轴是直线______．
