Are you looking for something fun and would you like to help other people in your free time? Then join us．
We have jobs for people of all ages；Anyone from twelve-year-old children to 80-year-old people can become one of us．
You can help people in many ways．Schools need help with taking care of children while their parents are working．Hospitals need us to look after children while their parents see a doctor．Animal lovers can help take care of those dogs and cats without homes．There is something to do for everyone．
"As a member of this group，I don’t want to get anything．Seeing the children's happy faces，I am happy，too．"said Susan，an old woman of 62．  
"I often played computer games in my free time before．Now I help older people learn how to use Computers，"said another one at the age of 18．
If everyone helps out a bit， we'll all have a better world to live in．
Interested? Call us on 3847613 or visit our website(网站)：http：//www．activol．com．

（2015•葫芦岛）如图所示滑轮组，在50s内将重5000N货物匀速吊起10m高．绳的自由端受到的拉力大小是1500N，关于该滑轮组的说法正确的是（不计绳重及摩擦）（　　）

阅读【甲乙】两段选文，完成各题。

【甲】

    故天将降大任于是人也，必先苦其心志，劳其筋骨，饿其体肤，空乏其身，行拂乱其所为，所以动心忍性，曾益其所不能。

    人恒过，然后能改。困于心，衡于虑，而后作；征于色，发于声，而后喻。入则无法家拂士，出则无敌国外患者，国恒亡。然后知生于忧患，而死于安乐也。

（节选自《生于忧患，死于安乐》）

【乙】

    越国大饥，王恐，召范蠡^①而谋。范蠡曰：“王何患焉？今之饥，此越之福，而吴之祸也。夫吴国甚富，而财有馀，其王年少，智寡才轻，好须臾之名，不思后患。王若重币卑^②辞以请籴^③于吴，则食可得也。食得，其卒越必有吴，而王何患焉？”越王曰：“善！”乃使人请食于吴。不出三年，夫差^④为禽^⑤。

（选自《吕氏春秋》有删改）

【注】①范蠡：人名，越国大臣。②卑：谦恭、恭顺。③籴：买进谷物。④夫差：吴国君主。⑤禽：通“擒”，捉住。