单选题 下面的例子采用的是______。 ＜? xml version="1.0"?＞ ＜FlightInfo> ＜Intro＞ The following flights have available seats: ＜SelectStmt＞SELECT Airline,FltNumber,Depart,Arrive FROM Flights＜/SelectStmt＞ ＜Conclude＞We hope one of these meets your needs＜/Conclude＞ ＜/FlightInfo＞