关于光纤通信，下列说法中正确的是（）

抛物线$x^2=4y$上一点A的纵坐标为4，则点A与抛物线焦点的距离为 （   ）

德国法学家耶林格说，“罗马曾三次征服世界，第一次以武力，第二次以宗教，第三次以法律……而第三次征服也许是其中最为平和、最为持久的征服”，在“征服世界的法律”中，最能够适应罗马帝国时期社会发展要求的是

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    Katy Ross is eighteen years old. She is now in Nepal, a small country on the north of India. Katy left school 8 months ago and soon she will go to university. She loves traveling and decides to visit Asia before she goes to university.

    Katy is living with a family in the capital of Nepal. She has learnt a lot about the country since she arrived 4 months ago. The family has two children but many uncles and cousins live with them in their big house. They have taken Katy to many parties.

    Katy teaches for four hours a day at a small school. All the classes are in English and the pupils have spoken English since the age of six. The older children speak English very well. Katy has taught writing, grammar and art, all in English. She enjoys art most. And she thinks the children like the lessons best, too.

    Katy has not a lot of time to see Nepal, but soon she will stop teaching and travel around Nepal with a friend. "After that," Katy says, "we will visit more countries in Asia. We're not sure which ones yet."

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 某校同学开展了如图所示“溶液酸碱性的检验”的实验活动：