A:利用植物的茎尖培养来培育无病毒植株
B:英国科学家利用细胞核移植技术克隆出小绵羊
C:荷兰科学家将人乳高铁蛋白基因移植到牛体内并获得成功
D:乘宇宙飞船上过太空的辣椒种子结出的果实较平常的大一倍以上
Name: Macy
Age: 10
Country: Canada
Family: father, mother, brother and me
School: Garden Primary School
Favourite subjects: Music, Art
Hobbies: drawing, playing the piano
Dear Wang Li,
Thank you for your email and your photo.
I'd like to be your e-friend too.
I am from
Write soon.
Yours
Macy
某课题的中心词是“杜鲁门主义”“欧洲一体化”“日本崛起”“中国振兴”“苏联解体”。由此推断,该课题的中心内容最有可能是( )