请回答下列问题：
根据表格内容，选择正确答案。
(a)This is Mariah Carey. She is a singer. She was born in 1970. Her birthday is March twenty-seventh. She likes singing.
(b)This is Lee Young Ah. She was born in 1971. Her birthday is January thirty-first. She is a great（著名的）movie star. She likes acting.
(c)She is ZhangYining. She's a sports star. She was born in Beijing in 1981. Her birthday is October fifth. She likes singing.
(d)Do you know Bill Gates？He was born in 1955. His birthday is October twenty-eighth. He likes playing golf (高尔夫球).
(e)This is Li Lianjie. He was born in Beijing in 1963. His birthday is April twenty-sixth. He is a great actor. He likes reading.
物体从光滑的斜面顶端由静止开始匀加速下滑，在最后1s内通过了全部路程的一半，则下滑的总时间为（ ）
甲、乙、丙三种同体物质的溶解度曲线如图所示，请回答下列问题：（1）t1℃时，三种物质中溶解度最大的是____．（2）使t3℃时接近饱和的甲溶液变为饱和溶液，可采用的一种方法是____．（3）t1℃时，将50g水放入盛有30g丙物质的烧杯中，充分搅拌，所得溶液的质量为____g．（4）将t3℃时甲、乙两种物质的饱和溶液降温到t2℃，析出晶体的质量关系为____（填字母）．
