He's never rude. I think he's one of the most _______ boys in his class.

    Hi! I'm Tony. I love 1! I always get up late on weekends. For breakfast, I only have 2. It's usually an apple. I have a big lunch. After lunch, I like to eat ice-cream. It 3 good. In the afternoon，I like to 4. I usually play basketball. Sometimes I swim. In the evening, I clean the house—I like 5rooms. I always go to bed late，at about 23: 00.

    But my sister doesn't like weekends. She has a job in a big store and she always works on weekends. She never goes out 6 her friends. She usually 7 home from work at 22:00. she 8 in bed after she takes a shower. But don't ask her 9 she reads. She always falls asleep (睡着) after 10 one or two pages (页).

材料二 1987年在广东东南濒临南海的阳江海域发现了一艘中国古代沉船，被命名为“南海一号”。这是迄今为止在环中国近海区域发现的沉船中年代最早、船体最大、保存最完整的远洋贸易商船。整船文物多达4～8万件，以瓷器为主，多为青釉瓷，许多瓷器带有明显的阿拉伯风格；一摞一摞的铁锅和一篓一篓的铁钉是另两宗大量出水货物；目前船中出水的铜钱有上万枚，年代最早的是汉代的“货泉”，年代最晚的是南宋高宗时期的“绍兴元宝”。

被称为“绿色水库”的生态系统是（  ）