American national holiday和American National Day有区别么?

American national holiday和American National Day有区别么? NBA means___.选项：A.National Basketball American.B.National Basketball Association.C.North Basketball American. “美国的国旗”英语是the American national flag吗 THE AUTRY NATIONAL CENTER OF THE AMERICAN WEST怎么样 “美国的国旗”英语是the American national flag还是the national flag of the USA National National National National national national National national national National the National Day of American Cowboy 是什么样的节日?可以稍微介绍下吗、 American American