对于下列几种化学符号，有关说法正确的是（   ）

①SO₂②Cu²⁺③H₂O₂④3SO ${}_4^{2-}$ ⑤N⑥ $\stackrel{+2}{Cu}O$ ．

完形填空

Dear Seth,

    You are only three years.old,and at this point in your life you are not able to understand this letter.But some day when you1,I hope you will find something2in what I am going to share with you.

    Life can be3.There will be people in your life who won't be very nice.They'll4you because you are different,5for no good reason.You will also face heartbreak and might be6by those you love.I hope you don't have to face these too much,but such things7.

    Be open to life anyway.You'll find cruelty（残忍）and8n your journey through life,but don't let that9you from finding new things.I don't retreat（退却）from life,and don't10or wall yourself off.Be open to new things,new experiences,and new people.You will11many times,but if you allow that to stop you from trying,you will12 many chances.Do remember failure is a stepping stone to13

    You will meet many people who will try to do14than you,in school,in college,and at work.They'll try to have nicer cars,bigger houses,nicer clothes,and so on.To15,life is a competition.However,I believe life is a16.If you always try your best to17others,you are wasting your life.Learn to enjoy your life18and you will make it a journey of 19of learning and of love.

    Finally,know that I love you and always will.You are20a really wonderful journey,and I will always be there for you.

Love

Dad

在“怎样使两个灯泡都亮起来”的活动中，小明采用如图所示的方法连接，结果两个灯泡都亮了．这时，两灯的连接方式是____ ．若电源电压为3V，灯泡的规格均为“2.2V  0.22A”，则每个灯泡的电阻是____ Ω，每个灯泡的实际功率是____ W。

通信设施是沟通你我的____怎能随意地弃置一旁，____通信设施吧，还它美丽的衣裳。

下列对各句加点字词按其用法分类，正确的一项是（    ）
①沛公欲王关中                        ②项伯杀人，臣活之
③臣具以表闻，辞不就职                ④晞一营大噪，尽甲
⑤范增数目项王                        ⑥常以身翼蔽沛公 
⑦太尉大泣曰：“乃我困汝！”            ⑧外无期功强近之亲