人体的同一性状常常有两种或多种不同的表现形式，例如：人的耳垂有分离（有耳垂）和紧贴（无耳垂）之分，眼睑有单眼皮和双眼皮的差异．下表是某家庭成员的部分遗传性状的调查结果，请回答：

下列关于细胞结构和功能的叙述，不正确的是

如图，P是⊙O外一点，PA是切线，A为切点，割线PBC与⊙O相交于点B，C，PC=2PA，D为PC的中点，AD的延长线交⊙O于点E，证明：

（Ⅰ）BE=EC；

（Ⅱ）AD•DE=2PB²．

材料一：中国国家海洋局2002年3月30 日发表的一份报告中说：中国的海洋污染问题日益严重，中国沿海最严重污染的海洋面积在去年增加了4000平方米，达32000平方千米，大约有17500平方千米的海域不合适海洋生物的生存．受污染最严重的区域一般靠近大城市和工业区，特别是渤海、东海和黄海的一些水域，主要的污染物可能是来自化学肥料的氮和磷酸盐．

材料二：一些专家指出，中国水域受污染的情况极为严重，还与中国沿海有着世界上最为繁忙的国际航运线路有关．例如，世界上一半以上的油轮航线经过我国南海．

   Mr. King works very long hours every day. He usually gets up at 5:30. He brushes his teeth quickly and goes to his workplace (工作地点). Then he runs with some kids. After that he takes a shower. He eats his breakfast at 7:00. His work starts at 8:10. He is good at math and many boys and girls learn math from him. All the kids like him very much. He often talks or plays games with the kids. He usually goes to bed after 22:00. He is often very tired but he likes his job and loves the kids. He doesn’t work on weekends. Mr. King likes reading at home on weekends. Sometimes some kids’ parents come to his home to talk about their kids. When Monday comes, Mr. King gets busy again