2015年5月26日13时左右，受当地部分农民群众收割作物后焚烧秸秆形成雾霾的影响，在沪渝高速公路湖北荆州段，相继发生15起交通事故，致使高速公路交通一度中断，并造成2人死亡，6人不同程度受伤。秸秆焚烧屡禁不止的原因有(    )

①秸秆处理的成本太高

②科技转化力度不够

③农村生活用能结构的改善

④农村劳动力的大量转移、

A={x|x²≥4}B={x|2^x=$\frac{1}{4}$}则A∩B=(    )

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1 每处错误及其修改均仅限一词；

2只允许修改10处，多者(从第11处起)不计分。

DearTom，

Howis everything going? I have favor to ask.Next week，I was going to a reception at the City Hall.As is expected，I'll meet some high school student and their teachers invitingfrom America.

Theonly problem is that because I'm not very good at small talks with people Idon't know.So I am worried that I will make a fool of myself but make othersembarrassing.I wonder if you would be kindly enough to give me some tips inwhat I can talk about with people from America.Are there any questions that youshould not ask?

Lookingforward to your early reply.

Yours

Li Hua