“惟欲征服支那（代指中国），必先征服满、蒙；如欲征服世界，必先征服支那。”（引自《田中奏折》）20世纪30年代，为了先征服中国，日本制造了一系列事变，其先后顺序排列正确的是
①“七七事变”②“八一三事变”③“九一八事变”④“华北事变”

C

    My family lives in London. In the morning, my father goes to work and we go to school. My father takes us to school every day. My mother stays at home. She does the housework. She always has lunch at home, and visits her friends in the afternoon. In the afternoon, we go home from school by bus. My father gets home from work late. At night my two brothers and I always do our homework. We go to bed at about ten. My father and my mother usually read newspapers. We can watch TV at the weekend.

如图为某物质的溶解度曲线图，对于该物质，下列说法不正确的是（　　）

科学家利用干细胞成功地培养出了心脏细胞，这最可能是（  ）