如图示意太阳直射点在南北回归线之间往返移动，分析回答下题．
—I'm not sure. Maybe five million.
①观察颜色 ②打开瓶盖看有无白雾 ③硝酸银溶液 ④湿润的红色石蕊试纸 ⑤湿润的蓝色石蕊试纸．
我国婚姻法禁止近亲结婚的医学依据是（ ）
When I opened the fridge, there ______ only some eggs and a bottle of milk.
