关于西气东输工程的叙述错误的是（ ）
A：主干管道三次经过黄河干流
B：主干管道经过我国三级阶梯
C：有利于缓解东部地区能源紧张状况，促进东部的发展
D：能增加西部地区的财政收入，带动西部的发展
what ,be ,an ,last, some ,the, in ,your ,black ,my ,call, how
Hello, everyone. I ____ Frank Smith.Frank is my first name.My ____name is Smith.This is my schoolbag.It's ____. In it,you can see ____books and a pencil box. ____ is that? Oh,it is a watch. And ____ watch is yellow. It isn't____ . I found it ____ Class 7A. Is it ____? Please ____ Frank at 9556833.
根据答语写出问句。
习惯上用S表示（ ）
