如图，已知某船向正东方向航行，在点A处测得某岛C在其北偏东60°方向上，前进8海里到达点B处，测得岛C在其北偏东30方向上，已知岛C周围6海里内有一暗礁，问：如果该船继续向东航行，有无触礁危险？请说明你的理由.

甘蔗制糖的比例通常是8吨甘蔗制成1吨糖，每吨糖的市场价是5 000元左右，每千米运费是2元/吨。如图是两种甘蔗制糖厂的区位选择方案。结合所学知识回答下列问题。

    People in the West didn't know coffee or tea two hundred years ago. They were 1 to drink them because they thought coffee or tea could kill a person. Once the king of England decided to find out 2 it was true.

    There were two brothers in prison(监狱) at that time.They would be killed 3 a few days because they did wrong. The king said, "I shall let them live but they must drink coffee or tea to the end of their lives. One brother must drink coffee and 4 must drink tea every day." And they followed the king's words.

    They both lived many years. At last, the elder brother died when he was eighty-three years old.The younger one died a few years later. After that, people 5 that coffee and tea were not bad to man.

在下面一段文字横线处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密。每处不超过15个字。

    二十四节气是中国古代用来指导农事的补充历法，是劳动人民长期经验的积累和智慧的结晶。中国自古以来，就是个农业非常发达的国家，①____，所以古代劳动人民从长期的农业劳动实践中，累积了有关农时与季节变化关系的丰富经验。为了记忆方便，②____：“春雨惊春清谷天，夏满芒夏暑相连，秋处露秋末霜降，冬雪雪冬小大寒。”二十四节气，由于综合了气象学以及农作物生长特点等多方面知识，比较准确地反映了一年中的自然力特征，所以在普遍使用公元纪年的现代社会，③____。