Here is the bulletin board of Class 3. Some of the students put their notes on it. Please read them and answer the following questions.

小题1:The Chinese meaning of "bulletin board" is _______.

A．电影广告

B．寻人启事

C．公告栏

D．通缉令小题2:According to the notes on the bulletin board, what holiday might be coming?

A．Christmas

B．Halloween

C．Thanksgiving

D．New Year's Day小题3:When Julia is busy, what does Alex always help her do?

A．To do math homework.

B．To clean the windows.

C．To have P. E. class together.

D．To take books to school.小题4:From the bulletin board, we know that Mr Chen is a ___________.

A．repeater

B．P.E. teacher

C．doctor

D．pilot小题5:Why does Bill lend books to Mario?

A．They are classmates.

B．Miss Li wants him to do so.

C．Bill has too many books.

D．Mario forgot to bring his books to school.

后浇带是当体积混凝土纵向长度超过50m时，存中间人为设置的施工缝，一般宽为（）．

A、60-80C、m

B、80-100C、m

C、100-120C、m

D、120-150C、m