读漫画“水患感恩”，回答下列问题。

下列各句中，标点符号使用正确的一项是 (　　)

已知函数f（x）=2cos²x+2$\sqrt{3}$sinxcosx+a，且当x∈0，$\frac{\mathrm{\pi }}{2}$时，f（x）的最小值为2．

（1）求a的值，并求f（x）的单调递增区间；

（2）先将函数y=f（x）的图象上的点纵坐标不变，横坐标缩小到原来的$\frac{1}{2}$，再将所得图象向右平移$\frac{\mathrm{\pi }}{12}$个单位，得到函数y=g（x）的图象，求方程g（x）=4在区间0，$\frac{\mathrm{\pi }}{2}$上所有根之和．

    This is a story about a famous scientist. After reading it，you may know what made him 1 from others.He said all his success came from an experience that happened2 he was five years old.At that time，he tried to take 3 bottle of milk away from the fridge.However，the bottle 4 and the milk was all over the kitchen floor.

    When his mother came in，instead of shouting at 5，she said，"Ben，what a great mess you have made!I have never 6 such a big puddle of milk.Would you like to play in the milk 7 a few minutes before we clean it up？

    Actually，he did.After a few minutes，his mother said，"Ben，you have made a mess like this，8 you need to clean it up.9 would you like to do that？With a towel or a mop（拖把）？"He  10 the towel and they cleaned up the milk together.

    Then his mother said，"You were not able 11 a big milk bottle with your small hands in the kitchen.Let's 12 the bottle with water and see if you can discover a way to carry it without  13 it."Finally，the

boy learned that if he held the bottle with14 hands，he could carry it and it wouldn't drop.

    From then on，the boy knew he didn't need to be afraid15 making mistakes.It was more important for him to find a way to correct the mistakes.

小琦的跳远成绩是一点五二米：____米。