1 The store has ____ a new kind of food for children.
A brought B offered C introduced D supplied
2 Parents have ____ concern about the amount of violence in some children's shows.
A explained B described C expressed D directed
3 profit 和benefit的区别
４every boy and every girl后的谓语是单数还是复数？

1 The store has ____ a new kind of food for children.
A brought带来 B offered给;提供 C introduced 引进D supplied供应(通常要付费的)
句子翻译为:那间商店已经给孩子们引进了一种新品种的食物.
选C

按您的说法,这里是"引进"的意思咯....
为什么不选D.D翻译为供应的意思,供应一般是指"正在供应",没有供应了的意思.在这里为现在完成时,强调结果.
因此应该是"引入"的意思."推行",一般的搭配为:推行政策....
如果不是供应的话.

2 Parents have ____ concern about the amount of violence in some children's shows.
A explained 解释B described 描述C expressed 表达;表示D directed 指向
句子翻译为:家长们都对一些儿童节目所涉及的暴力成分表示担忧.
选C
3 profit 和benefit的区别
profit通常指扣除成本后所净得的利润.通常作为复数名词出现.
作为动词用时:profit ...from...
benefit可以表示很多,如"利润,好处,有益.并不一定是指通过劳动得到的利益和扣除成本的.表示"好处"时,可以是一些很小的利益,范围比较广.
作为动词用时:有搭配:benefit...from..从...中获益.

４every boy and every girl后的谓语是单数还是复数？
谓语用单数.

详细点讲吧.当以and连接的两个并列主语前有every /each等修饰时,谓语动词用单数.把它当固定用法来看就好了...