①初中学生遇见有人落水，不假思索，下水营救

②骑车过马路，遵守“红灯停，绿灯行”的交通规则

③为改善双休日伙食，两同学结伴到田野里捕捉青蛙

④学校草坪上设置温馨提示：“小草也是生命，请脚下留情”

河南省文物局2009年12月27日对外公布，魏武王曹操高陵在该省安阳县安丰乡西高穴村被发现。如果你想了解曹操，应查阅的历史时期是（   ）

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  Dear Peter，

    Without knowing more about you，it's hard for me to give you some good advice．

    But firstly．I am sure that you are 1 ．You said that nobody would care if you left  home．What about your2  ? And other family members ?It seems that you are very 3．You'd better go to a doctor or talk  4 your parents．They will be able to help you．

    Secondly，I'm sure there's someone else in your class who feels lonely，  5．You never know 6other people feel．Try to make friends with your classmates．And you could  7  a club to meet new people and make friends，too．

    You 8  find happiness in yourself．So my 9advice is to write a list of all the good things about yourself，learn to like yourself，and then  10  will see your confidence(信心)and like you，too． 

                                                                                                                                                                                                                   Yours，

                                                                                                                                                                                                                     Lily

一般来说，聚落密集的地区（　　）

①经济比较发达②交通比较发达③人口密度比较大④环境优美，空气清新．