阅读课文《穷人》，回答问题：

①请找出文中能显现桑娜一家生活艰辛的语句。想一想：桑娜一家生活艰辛还能照料邻居的孤儿，这说明什么?

②找出课文中对渔夫的语言描写内容，说说你眼中的渔夫是一个怎样的人？

在生活中，手指上会粘上许多细菌．假设：常洗手可以减少手上的细菌数量．甲乙两个同学设计了一个实验，利用牛肉汁固体培养基，灭菌后分别进行细菌培养实验．如图所示，请评价他们的实验方案．

阅读理解

    Is there link between humans and climate change or not? This question was first studied in the early 1900s. Since then, many scientists have thought that our actions do make a difference. In 1997, the Kyoto Protocol explained our role in the Earth's changing atmosphere and set international limits for gas emissions(排放) from 2008 to 2012. Some countries have decided to continue these reductions until 2020. More recently, the Paris Agreement, stuck by nearly 200 countries, also aims to limit global warming. But just now how much warmer it will get depends on how deeply countries cut carbon emissions.

如图，四边形ABCD绕D点旋转180°，请作出旋转后的图案，写出作法，并回答下列问题：