阅读下列对话,判断正误。
Miss White:Boys and girls ,we have three new friends today.
Mary: Hello, I’m Mary. I'm from the UK.
Lily : Hi, I'm Lily. I'm an English girl, too.
Zhang Shan: Hi, I'm Zhang Shan. I’m from Beijing.
Boys and girls: Welcome!
东北平原比华北平原湿润的原因是因为东北平原的( )