A:该动物正常体细胞内有4条染色体
B:图1中表示减数分裂的是细胞甲
C:图2中c→d是因为着丝点的分裂
D:图1中的细胞乙对应图2中的bc段
根据材料完成下列各题。BeethovenBorn in 1770 in GermanyA musician (音乐家)Died in 1827Florence NightingaleBorn in Italy on May 12th, 1820An English nurseDied in 1910Bill GatesBorn in I955 in the USAWrote Business @ the Speed of ThoughtOwns MicrosoftThomas EdisonBorn in 1847 in the USAMade over 1,000 inventions (发明)Died in 1931Yao MingBorn on September 12th, 1980 in Shanghai, ChinaA basketball playerPlayed for the Houston Rockets, the USA
1小时的13是____分钟;1小时的56是____分钟。