3.D细节理解题。根据France部分的“Due to healthy habitsand a longer lifespan,grandparents are better able to play anactive,familial role,into a more advanced,older age.”可知，法国的爷爷奶奶们与家庭的关系变得更加紧密。

4.B细节理解题。根据第一段的“Kampo wondered how plasticcould be transformed into something useful.”可知，AboubacarKampo在非洲与塑料污染作斗争。

5.C推理判断题。根据第二段的“He realized its social impactand the environmental benefits,and thought it could not just helpwith the plastic problem but also improve children’s access toeducation.”可知，这家哥伦比亚公司的产品可以一举两得。

6.B细节理解题。根据第三段的“….1.6 million children inCote d’Ivoire don’t go to school.One reason is that there aren’tenough classrooms.”可知，教育资源的缺乏导致很多非洲孩子辍学。