6. bioclock: 海滩上有种东东, 好长的单词, 象是一种海藻, 当潮水来前那一刻会马上缩进海滩里, 退潮后又会出现. 很准时并且都是在白天. 这种现象引起了科学家的兴趣, 就来研究了(吃饱了撑着?) 还带了一些回去. 发现在实验室持续灯光下, 其它条件也不变的情况下, 这些alga still burrow in and out in some days. then they conclude that there must be something inside themseleve that enalbes these functions. researchers hypothesis it is a bioclock. Second para. these alga\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ s behaviors can also be altered by some environmental means. they compare this to a human watch: people cannot make watch run faster or slower but certainly can change watch time by reseting watch hands...
11. Hospital competition problems. Hospitals hire some doctors because they can attract more patients.....the hospitals use the high tech equipments to attract these doctors....