[解析]
(1)B.推理判断题。根据第一段During the summer holiday,some students might have been busy with traveling,summer camps and all kinds of courses.But a special group of Chinese middle school students decided to taste the hardship of life outside school.在暑假期间,一些学生可能忙于旅游,夏令营和各种课程。但有一群特殊的中国中学生决定在校外体验生活的艰辛。结合后文提到了他们卖蔬菜的艰辛,可知,在作者看来,这12个学生的行动是鼓舞人心的。A.popular受欢迎的;B.encouraging鼓舞人心的;C.strange奇怪的;D.embarrassing令人尴尬的。故选B。
(2)D.细节理解题。根据第三段"Compared to traveling,such social practice connects us and makes us learn how tough our parents are," said Dalin,18,to the City Morning Post.Dalin,a senior high graduate,and her 12﹣year﹣old brother Xiaolin came up with the idea.18岁的大林在接受《城市晨报》采访时表示:"与旅行相比,这样的社会实践让我们联系了起来,让我们了解到父母有多艰难。"高中毕业生大林和她12岁的弟弟小林想出了这个主意。可知,这对表兄弟决定在市场上卖蔬菜,以了解他们的父母工作有多努力。故选D。
(3)A.细节理解题。根据倒数第五段To lower the cost,they learned to bargain with the sellers.为了降低成本,他们学会了与卖家讨价还价。可知,他们与卖方讨价还价以降低成本。故选A。
(4)D.标题归纳题。根据第二段Twelve students in a big city sold vegetables at a local market together.Within 12 days,they made more than 1,500 yuan.Among them,the oldest is 21 years old,while the youngest is just 10.They are all cousins in a big family and eight of them are from rural areas.在一个大城市,12个学生一起在当地市场卖蔬菜。在12天内,他们赚了1500多元。其中,最大的21岁,而最小的只有10岁。他们都是一个大家庭的表兄弟,其中8人来自农村地区。结合文章讲述了一个大家庭的12个表兄弟在当地市场卖蔬菜赚钱,其中8人来自农村地区。接受采访时,高中毕业生大林表示,她和她12岁的弟弟小林想出了卖蔬菜来体会父母艰辛的办法,讲述了他们卖蔬菜的经过以及体会。可知,D选项"表兄弟卖蔬菜"最符合文章标题。故选D。