下列技术应用中，不是利用电磁波工作的是

A．利用微波雷达跟踪飞行目标

B．利用声呐系统探测海底深度

C．利用北斗导航系统进行定位和导航

D．利用移动通信屏蔽器屏蔽手机信号

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。

Everyone had a childhood. And childhood experiences are often very funny. Children often make us    小题1:(laugh). It’s true    小题2:children brighten up a home. They never turn off the lights.

I often recall my childhood, the years   小题3:   many interesting things happened. When I was a two-year-old child, both my parents were always very busy with their work. My mother worked   小题4:   a sales manager in a company while my father served in    小题5:  army. So I lived with my grandma in a village. I was always waiting for my parents at home. Once my father    小题6:  (send) us a photo of his in a soldier’s uniform,    小题7:  was posted on the table reminding me of him.

Once my mother came to see me and we went   小题8:  (shop) together. On the way we saw a group of soldiers. And when I saw them, I became very    小题9: (excite). I said in a ringing voice pointing to    小题10:  , “This is my father, and this is my father, and that is my father, too!”

My mother said she would remember that moment all her life.