人的神经系统由中枢神经系统和周围神经系统连部分组成，中枢神经系统包括____ 和____ ，神经系统结构和功能的基本单位是____ ．反射是神经系统调节生命活动的基本方式，分为____ 和____ 两种类型．

利用钨制作灯泡里的灯丝，而不用锡的主要原因是（　　）

完形填空

  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

填入下列句中横线处的词语恰当的一项是（    ）

①真正的修养一如真正的体育，同时既是完成又是激励，随处都可到达终点却从不停歇，永远都在半道上，都与宇宙        ，生存于永恒之中。

②如果说，十六届三中全会提出的科学发展观是2003年的改革进军号的最强音的话，那么，2010年的最强音，就应该是四中全会提出的构建社会了。

③有        的人不会在别人需要宁静时旁若无人地喧哗。