题干
根据短文内容和所给中文提示，在空白处填入单词，每空限填一词。
Bryant is my uncle. I know a lot ____(关于) him. He has a ____(儿子). He reads a lot in the city ____(图书馆). My uncle can ____(拼写) many English words. He is very ____(井井有条的). He ____(总是) puts his books in the bookshelf. I ____(必须) learn from him.He also likes animals. He has____(一些)pet ducks and two pet dogs. One dog is called ____(零) and the other is called One. My uncle is ____(他们的) good friend.
答案(点此获取答案解析）
about,son,library,spell,tidy,always,must,some,Zero,their
轴的非负半轴为角的始边，如果角
、
的终边分别与单位圆交于点
和
，那么
等于