—The American warships（军舰） have appeared near South China Sea Islands again.
—We must let the Americans know clearly that the islands ______ China.
A：come from
B：belong to
C：care about
D：believe in
下列有关动植物生殖、发育的叙述中，错误的是（ ）
在生物分类的七个等级中，生物的共同特征最多和最少的分别是（ ）
