“在竞争中合作”需要我们形成团队精神，下列关于“团队精神”的说法正确的是（  ）
①团队精神是团队内部形成的上下一致、相互支持、密切合作、无私奉献的群体精神
②在学校，团队精神体现在校风、班风以及各种各样的活动之中
③在社会，团队精神体现在敬业和与同事的精诚合作之中
④团队精神的核心是集体主义，是合作共享乐于奉献，是个人利益服从团队的利益。

设f（x）为奇函数且在（﹣∞，0）内是减函数，f（﹣2）=0，且x•f（x）＞0的解集为（　　）

    “Early to bed, early to rise, makes a man healthy, wealthy(财富) and wise (智慧).”

    This is an old English saying (谚语)．Did you hear of it? It means that we must go to bed early and ____ up early in the morning．Then we will keep ____．We'll also be rich and clever.

    This is true．The body must have ____ sleep to be healthy．Children of young age should have ten ____ sleep every day．Children who don't have enough sleep can't do their work very well．They won't be clever and they may not become rich!

    The body also needs ____．Walking, running, jumping, swimming and playing games are all exercise．Exercise the body strong(强壮).

    Exercise also helps the blood(血) to ____ around inside the body．This is very important．Our blood ____ food to all parts(部分) of our body．The head also needs blood． Exercise helps us to think____.