阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。

    As we know, it is important to be honest with children. But there are some things in this world that simply aren't 1 . Sometimes it makes sense for parents to2to their children.

    I still remember my three-year-old daughter's face when we watched the 3that twenty children at Sandy Hook Elementary School had been killed. After a few minutes she 4and put her5arms around my legs and said, “I love you, Momma.” I was still 6whether or not to turn the TV off when she, 7, asked, “Momma, why aren't those kids OK?” I just 8that they were smart children,9 they did something wrong and got punished.

    We're not all 10of a little lie here and there. Santa Claus, the Easter Bunny and Snow White are just a few examples of 11for parents to keep magic in the world. Magic, imagination and creativity are very essential in life, 12 for children. These stories battle against the negative aspects of the world and create 13. In the end children will be able to 14what is true and what was made to 15their lives. Out of five brothers and a sister I can happily report that not one of the children I grew up with was16when we discovered who all those17people really were.

    In life, a parent is the 18of knowledge, and it is up to the parent to decide what knowledge to teach and when. There's no 19to tell children all about the truth. As they become20, they will have a better understanding of the world.

分析实验，回答：

使分式$\frac{1}{3-x}$有意义的x的取值是（　　）

《大道之行也》选自____，这是____的经典著作之一。是西汉____对秦汉以前各种礼仪论著加以辑录，编纂而成的。

例：寒冷对冬天正如炎热对夏天。

①勤奋对聪明正如懒惰对____。

②偏僻对山区正如繁华对____。

③表扬对成绩正如批评对____。

④医生对医院正如教师对____。