[解析]
(1)A.细节理解题。根据原文第一段"Last month,I took my son Tom to see his grandparents in the countryside.上个月,我带儿子汤姆去乡下看望他的祖父母。"可知汤姆上个月去和母亲一起去乡下。故选A。
(2)D.细节理解题。根据原文第二段"Why can a hen fly?母鸡为什么会飞?"可知汤姆好奇的是为什么母鸡会飞。故选D。
(3)C.细节理解题。根据原文第二段"I ran fast and stood between the dog and the hen,shouting at the dog to drive it away.我跑得很快,站在狗和母鸡之间,冲着狗喊叫,想把它赶走。"可知作者对那条狗大喊大叫是要把它赶走。故选C。
(4)A.标题归纳题。本文是一篇记叙文。文章作者通过和儿子去乡下父母家看到的母鸡被小狗追赶而飞起来引出爱的话题。根据原文最后一段"Maybe because of love,the love to her children more than her own life.也许是因为爱,她对孩子的爱超过了她自己的生命。"可知这篇文章最好的标题是:因为爱。故选A。