—I don't have soccer ball．
A：／; a
B：the；a
C：a；the
D：／; the
①牺牲个人利益，维护国家利益 ②积极参与竞争，实现个人追求
③增强忧患意识，立志报效祖国 ④树立崇高理想，提高自身素质
The children are making so much ______.Ple ase tell them to be quiet.
皮肤能防止病菌侵入人体，与这种免疫属于同种类型的是（ ）
