A:¬p:∀x∈R,x2≥sinx
B:¬p:∀x∈R,x2<sinx
C:¬p:∃x∈R,x2≥sinx
D:¬p:∃x∈R,x2≤sinx
I think it's too expensive. I'd like a ____ (cheap) one.
我国古代哲学家管仲说:“善气迎人,亲如弟兄;恶气迎人,害于戈兵。”这句话启发我们在生活中要( )