根据文意及首字母提示补全短文。

      As everyone knows, not o____ fast walk but also slow walk does good to the muscles and lungs of human. So people walk to build up their bodies, or to lose w____. But only some of them know that taking a walk every day is also good for p____ people's hearts. Heart attack has become the first disease in the world b____ more and more people suffer from it.

    Taking a walk can improve the blood supply to our hearts. If you try to walk as o____ as possible, you'll have a healthier heart.

汉乐府“孔雀东南飞”中焦仲卿妻“十三能织素，鸡鸣入机织，夜夜不得息”。她身上装扮是“妾有绣腰襦，葳蕤自生光”。她床上装饰是“红罗复斗账，四角垂直香囊。箱帘六七寸，绿碧青丝绳”。这些描述主要反映了

【环境保护】根据图文材料，完成下列要求。

材料：一项最新科学调查发现，全球海洋表面漂浮着约5．3万件塑料垃圾，总重量接近27万吨，这些塑料垃圾中绝大部分宽度不足5毫米。下图示意太平洋海域的塑料垃圾分布（图中白色斑点表示塑料垃圾集中之处）。

李明同学做了如下实验：取标号为A,B,C的三支试管，各加入2毫升稀淀粉糊，然后将这三支试管放入37.5℃水浴锅中，15至20分钟后，各滴3滴碘液．下列关于这个实验的表述正确的是（  ）