I have two friends. They are Bob and his sister Amy. Look! Bob

has a white T-shirt. He is not tall but fat. He is 10 years old.He

can ride a bike. Amy is the girl. She has a red skirt. She likes red

very much. She can fly a kite. She is 9 years old.

Oh! Look! The boy is me. I have a big mouth and long hair. I am

10 years old. I like swimming. I can swim very well. The little dog

is my friend, too. He can run and jump. He has big ears and a big

mouth. He is cute (可爱). I love him.

用同位素¹⁴C标记的吲哚乙酸来处理一段枝条的一端，然后探测另一端是否含有放射性¹⁴C的吲哚乙酸存在。枝条及位置如图,下列有关处理方法及结论的叙述正确的是（   ）

如图为植物细胞分裂过程中不同时期的图象，按发生的先后顺序，排列正确的是（　　）

朝鲜战争爆发后，美国通过向日本“特需订货”促进了其经济发展。越南战争爆发时，日本已跃居资本主义世界经济第二位，美国深陷越战不能自拔，又为日本发展提供了契机。这表明（    ）