题干

如图,AB是⊙O的直径,CD是⊙O上的两点,若∠BAC=20°,=,则∠DAC的度数是(   )

A:30°

B:35°

C:45°

D:70°

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B

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                                                                                         出售欲望的孩子
                                                                                               占保祥
         卡尔从小被祖母拉扯大,性格偏激执拗,方圆几个社区,没人愿意招惹他。
        13岁那年,一次喝酒后,卡尔竟抢了一位妇女的挎包,里面有几百美元现金。从此,卡尔爱上了抢劫,欲罢不能,无人不知他的恶行。校长对他很是头疼,不知道如何处理这个孤儿。
        事情越演越烈,卡尔的欲望愈发膨胀起来。在学校,他成了老大,拉帮结派,唯我独尊,公开旷课,还常常偷同学的东西。
        被学校开除后,卡尔才明白自己的行为损害了祖母的尊严。想到祖母苍老的面庞,他无地自容。走在匆忙的人群中,卡尔看见了一个小个子的老者,  他的钱包露了出来,简直是天赐良机。瞬间,欲望控制了卡尔,他跟随着老者,走街串巷。终于,老者走累了,坐在地上休息。
         卡尔的手伸向了老人的钱包。一刹那间,钱包就落到了卡尔的手中。卡尔本来是这样设想的:拿到钱包后,冲老人扮一个鬼脸,然后逃之天天。但他的手却遭到了强有力的反抗,老人的手像钳子一样抓住了他的手。A卡尔看到了一张狰狞的脸,可怕的脸。老人什么也没说,反身将他塞进了身后的小屋里
         老人问他,说吧,怎么办?是送到警察局,还是私了?别送警察局了,丢面子。卡尔垂头丧气地说。那好吧,看来你是个惯犯,有这样的本事也算了不起。我有个孙子,很想学会这一招,你将欲望和技能卖给他吧。话音未落,一个年轻人推门走了进来。他叫奇里,你现在把你所有的技术传给他。但要记住,以后你永远不能再有这样的欲望和行为了,否则你就是侵权。如果发现你再做坏事,就将你扭送到警察局和专利局,因为你同时犯了两大罪,要受到严厉制裁。
       老人的话说得斩钉截铁,容不得卡尔不同意。老人拿出一张协议书,抬头写着:出售欲望协议书。老人握着卡尔的手,让他摁下了手印。卡尔被放出来时,感到一阵恐惧和失望。他想到了老人的脸,那双有力的手,还有那张协议书。
        卡尔回到家时,祖母正在与老师谈话。看到祖母向老师求情的表情,卡尔不由失声痛哭。他发誓再也不做对不起祖母的事。
回到学校后,卡尔解散了“坏蛋组织”,一心一意做个好孩子。欲望再次袭来时,眼前便立刻浮现出那位老人的脸。他不敢出手,他害怕报复,害怕那间小黑屋。
        卡尔考上高中后,身上的臭毛病彻底改掉了。渐渐地,祖母也年迈多病,无力再管制他。他学会了自立,每天帮祖母打扫房间、做饭,邻居们都夸他是一个懂事的孩子。
        那天,卡尔正在侍弄庭院里的鲜花,一位老人推开了他家的院门。卡尔上前询问,却发现是那张可怕的脸。正是那个老者。
        卡尔心想,他一定是想将以前的事告诉祖母,无论如何不能让他见到祖母,否则祖母的病会雪上加霜。B这时,老人走了过来,脸上却荡漾着慈祥的微笑。他摸摸卡尔的头,问:你奶奶呢?她不在家,出去了,我知道你想做什么。你不能这样对待一位病中的老人!卡尔正言厉色。学会护着奶奶了?好孩子,我是来看望你奶奶的,这不,牛奶、鲜花。老人说着,指了指手中的袋子。原来他和祖母认识。卡尔一脸疑惑。
        老人进了屋,屋内传来了奶奶与老人开心的对话。卡尔忍不住贴在门上偷听。听到一半时,卡尔禁不住潸然泪下。
        这个出售欲望的孩子,当晚在日记中这样写道:欲望是可以出售的,但亲情和尊严永远不能。