“创建国家环境保护模范城市”，是重庆市政府正在实施的一项民生工程，下列做法不利于该项工程实施的是（　　）

如图，四条平行直线l₁，l₂，l₃，l₄被直线l₅，l₆所截，AB：BC：CD=1：2：3，若FG=3，则线段EF和线段GH的长度之和是（　　）

如图，AB是⊙O的直径，弦DE垂直平分半径OA，C为垂足，DE＝3，连接DB，过点E作EM∥BD，交BA的延长线于点M．

（1）求⊙O的半径；
（2）求证：EM是⊙O的切线；
（3）若弦DF与直径AB相交于点P，当∠APD＝45º时，求图中阴影部分的面积．

阅读下面的文字，完成文后各题。

八千岁

汪曾祺

    ①他是靠八千钱起家的，所以大家背后叫他八千岁。他如果不是一年到头穿了那样一身衣裳，也许大家就不会叫他八千岁了。总是一身老蓝布，年复一年。有些地方已经洗得露了白色，打了许多补丁。长度一律离脚面一尺。八千岁有八千岁的道理，衣取蔽体，下面的一截没有用处，要那么长干什么？

    ②八千岁开米店。店堂里一块竖匾：“食为民天”。竖匾两侧，贴着两个字条，“僧道无缘～概不做保”。和尚来化缘，一看“僧道无缘”四个字，也就很知趣地走开了。不但僧道无缘，连叫花子也“概不打发”。叫花子知道不管怎样软磨硬泡，也不能从八千岁身上拔下一根毛来，也就都“别处发财”。

    ③宋侉子是个世家子弟，吃喝嫖赌，无所不为，特别爱养骡马。没几年就把祖产挥霍去一半，干脆做起了骡马生意。他相骡马有一绝，一次只买几匹，但要是好的，很大的价钱买来，又以很大的价钱卖出。那一年，他带回两匹大黑骡子，来看的人不断，一问价钱，就不禁吐了舌头。八千岁带着儿子到宋家看了看，心里打了一阵算盘。他知道宋侉子的脾气，一口价，当时就取了八百大洋，一手交钱，一手交货。达件事哄动全城。一连几个月，八千岁买骡子的壮举，成了大家茶余酒后的话题。

    ④八千岁每天的生活非常单调。量米、看稻样，没什么事的时候，他就到后面看碾坊。这年头大部分米店都已经不用碾子，改用机器轧米了，八千岁却还用这种古典的方法生产。他舍不得这副碾子，舍不得这五匹大骡子他不看戏，不打牌，不吃烟，不喝酒，食谱非常简单，顿顿都是头糙红米饭。菜是一成不变的熬青菜，有时放两块豆腐。稻仓里有许多麻雀，宋侉子有时拿扫帚拦空一扑，能扑下十几只，说这是下酒的好东西。八千岁可不吃这种东西，有什么吃头！

    ⑤八千岁万万没有想到，他会碰上一个八舅太爷。

    ⑥八舅太爷是个无赖浪子。初中毕业后，上了一年美专，都没上完，却入了青帮，从此就无所不至。后来混进了军队，在军队中很“兜得转”。抗战军兴，军事第一，他到了哪里就成了这地方的最高军政长官，只要他一拍桌子，骂一声“汉奸”，就可以拉出去枪毙，没人敢惹他。

    ⑦他还很风雅。谁家有好字画古董，有借无还。他也不白要你的，会送一张他自己画的画跟你换。他不是上过一年美专么？他有一匹鸟骓马，请宋侉子来给他看看，嘱咐宋侉子把自己的踢雪鸟骓也带来。千不该万不该，宋侉子不该褒贬了八舅太爷的马。八舅大爷问：“你那匹是多少钱买的？”宋侉子知道反正这匹马保不住了，就顺水推舟，很慷慨地说：“旅长喜欢，留着骑吧！”——“那，我给你画一张画吧！”

    ⑧宋侉子拿了这张画，到八千岁米店里坐下，说不出话来。八千岁劝他：“算了，看开一点。”宋侉子只好苦笑。

    ⑨没想到，过了两天，八舅太爷派兵把八千岁“请”去了。八千岁只来得及跟儿子说一句：“赶快找宋大伯去要主意！”

    ⑩宋侉子一了解，案情相当严重，是“资敌”。八千岁有几船稻子，运到仙女庙去卖，被八舅太爷的部下查获了。仙女庙是敌占区，别的粮商都是事前打通关节，八千岁没有花这笔钱。宋侉子知道这是非花钱不能了事的，就转弯抹角地问。“至少得罚一千现大洋。”宋侉子说：“他拿不出。你看看他穿的这身！”“包子有肉，不在褶儿了。看你的面子，少要他二百！他肯花八百块钱买两匹骡子，还不能花八百块钱买一条命吗！”

    Diane Ray was completely self-centered and very spoilt. Her parents gave her1she wanted, knowing that she would throw a temper tantrum(耍小孩脾气)if they did not. She would scream and kick and2on the floor drumming her heels. Her parents always3.

    That was why she was alone on the4, wearing an expensive swimsuit. It has taken a massive tantrum to5her parents to buy it. They were back at the beach-house,6from the tantrum she had thrown when they told her that it was too dangerous to go diving7. “Dangerous?” she had said. “You just don't want me to have8. I'm going and if you try to stop me, I'll scream.”

    “What are you doing ?” a voice asked. Diane jumped. She did not know that the man was there9  he spoke .

    “I'm going diving, ” she answered.

    “You shouldn't swim that day, ” the man10. “There is a storm coming up.”

    “You should mind your own11!” Diane replied and walked into the gentle waves.

    “If you go out there you'll be12,” the man called after her. She did not bother to reply.

    Diane slipped into the water and dived13until white caps began rolling in and it became harder to14against the current (水流). Saltwater hit against her face, making it15to breathe. Oh, why had she not listened to advice.

    Panicking, she began to16. Then, just as it seemed as if she would slip beneath the surface, she heard a17voice. “Hold on ! I'm coming.” With18, she saw the old man rowing an ancient-looking boat towards her. “I hope you've learned a lesson. You put us both in19, ” he shouted angrily, as he dragged her over the side of the20. Gratefully, Diane thanked him and ran towards the beach-house.