下面关于人口迁移的说法,正确的有( )
A:凡人口在两地区间的空间移动,均称为人口迁移
B:参与新、马、泰十五日旅游,这属于人口迁移的范畴
C:我国大学生赴欧美留学攻读硕士、博士学位,属于人口迁移
D:属人口迁移范畴的迁移人口,其空间移动距离至少应在500千米
A
The Double Ninth Festival is a traditional (传统的)Chinese festival. It usually comes in October or November. On this day,people always wear the zhuyu (茱萸)plant. They usually climb mountains. Sometimes they go to see flower shows. The Double Ninth Festival is a festival for old people. People usually visit their parents and grandparents on this day. They often eat Double Ninth cakes together.
下列食物链不正确的是( )