已知函数y=ax²+bx+c的图象如图所示，那么关于x的方程ax²+bx+c+1=0的根的情况是（　　）

铅球重4____

篮球重650____

乒乓球重4____

杠铃重50____

    We live in a world full of many different kinds of people. We want to get along well with others. We also want to be liked by others. The following ways will make others like you.

    Do This and You'll Be Welcome Anywhere

    Become really interested in other people. A show of interest must be true. It brings good results not only to the person showing the interest, but also to the person receiving the attention. It is a two-way street—both of you get an advantage.

    A Simple Way to Make a Good First Impression

    Smile as often as possible. Your smile is a sign of kindness. When someone feels stressed from his or her teachers or parents, your smile is like the sun breaking through the clouds, your smile can help him or her realize that all is hopeful—that there is still joy in the world.

    If You Don't Do This, You Are Getting into Trouble

    Remember a person's name. A person's name is the sweetest and the most important sound in any language. We should realize the magic in a name. The name makes the person different from others; it makes him or her special among all others. If you remember a person's name, the relationship between both of you will become much closer.

    An Easy Way to Become a Good Talker

    Be a careful listener first. Ask questions that other persons will like to answer. Encourage them to talk about themselves and their achievements. What you need to do is just to listen, because people are much more interested in themselves.

    詹天佑经常勉励工作人员，说：“我们的工作首先要精密，不能有一点儿马虎。‘大概’‘差不多’这类说法不应该出自工程人员之口。”他亲自带着学生和工人，扛着标杆，背着经纬仪，在峭壁上定点、测绘。塞外常常狂风怒号，黄沙满天，一不小心还有坠入深谷的危险。不管条件怎样恶劣，詹天佑始终坚持在野外工作。白天，他攀山越岭，勘测线路；晚上，他就在油灯下绘图、计算。为了寻找一条合适的线路，他常常请教当地的农民。遇到困难，他总是想：这是中国人自己修筑的第一条铁路，一定要把它修好；否则，不但惹得那些外国人讥笑，还会使中国的工程师失掉信心。