化学就在我们身边，化学与生活息息相关．

（1）西瓜有甜味，主要是因为含有六大基本营养素中的 ____．

（2）为了预防佝偻病和发育不良，提倡幼儿及青少年适当食用富含 ____元素的食物．

（3）某服装标签上写着“涤纶56% 棉44%”，其中属于合成纤维的是____　．

（4）某市国家档案馆采用了太阳能光伏发电照明．太阳能是 ____能源（填“可再生”成“不可再生”）．

（5）南宁市采用LNG（液态天然气＞作为燃料的新能源公交车己相继投入使用．煤、 ____和天然气都属于常见的化石燃料．煤燃烧时排放出 ____、NO₂等污染物，这些气体或气体在空气中发生反应后的生成物溶于雨水，会形成酸雨．

The Penguins

    Skipper and his fellow penguins were originally just supporting roles in animated film Madagascar (2005). But in 2008 they took leading roles in their own TV series, and in 2014 starred in the film Penguins of Madagascar. The penguins' wisdom and humor not only appeal to kids, but also serve adult audiences well. So, it's not surprising that they get their own movie.

Scrat

    A small and furry squirrel with a long tail from animated movie Ice Age (2002), Scrat played a supporting role but has won the hearts of both children and grown-ups with his persistence(毅力). In the film, his chasing after his prized acorn(橡子) causes an Earth-shattering geological event. Scrat is a big part in the lasting attraction of the movie series Ice Age. Today, Scrat has his own animated mini-movies.

如图丙所示，用笔画线代替导线将电灯和开关接到电路中．