题干

若a的值使得x2+4x+a=(x+2)2﹣1成立,则a的值为(  )

A:5

B:4

C:3

D:2

上一题 下一题 0.0难度 选择题 更新时间:2010-03-18 10:42:05

答案(点此获取答案解析)

C

同类题2

阅读下面的短文,掌握其大意,然后从短文后各题所给的A、B、C、D四个选项中,选择最佳选项。
    Joe lost his arms in an accident that killed his father. Since then, he has had to depend on the 1of his younger sister Ella. In order to take care of him, Ella became his shadow, never leaving him 2 for years. Except for writing with his toes, he was completely unable to do anything in his life. 
    As they grew up together, they had their share of 3and they would often quarrel. Then one day, Ella wanted to separate from Joe, living 4 own life. So Joe was heart-broken and didn’t know what to do.
    A 5 misfortune (不幸) struck Rosa, too. One night her mother, who suffered(受苦) from mental illness, 6. So her father went out looking for her mother. She tried to cook meals for her parents, only to overturn the kerosene light on the stove, resulting in a fire which took her hands away.
    Though her elder sister Susan showed her willingness to take care of her, Rosa decided to be7 independent. And most of all she learned to do things on her own. Once she wrote the following in her composition: “I'm lucky. Though I lost my arms, I still have legs. Though my wings are broken, my heart can still 8.”
  One day,Joe and Rosa were both invited to a television interview program. Joe told the TV host about his 9 future at being left on his own, while Rosa was full of hope for her life. They both were asked to write something on a piece of paper with their toes. Joe wrote:My younger sister's arms are my arms; 10 Rosa wrote: Broken wings, flying heart.
    They had both stood the same sufferings, but their different 11 determined(决定) the nature of their lives. It is true that life is unpredictable. How you deal with misfortune is the true test of your character. If you choose only to complain and run away from the suffering,it will always 12 you wherever you go. But if you decide to be strong, the hardship will turn out to be a fortune on which new hopes will arise.

同类题4

阅读下面的文字,完成下列小题。

水兮 水兮

    ①一河碧水,与一位殉道者的英名一起响彻千年,澎湃汹涌了整部历史的河流。

    ②如果说一座楼阁可以属于王勃,一爿草堂可以属于杜甫,甚至一个偌大的曲阜可以属于孔丘,那么,汨罗江应该是属于屈原的。楚地的山川,浩瀚江湘,云梦大泽,想像当年那位落魄逐臣,就在这秀丽景致间披发行吟,乘一叶扁舟,朝发枉渚,夕宿辰阳,曾怎样在浩浩江水中上下行浮。想像踽踽独行仰天长问的夫子,曾怎样辗转迁徙,上下求索,掩涕叹息;想像这皎然的江水是怎样承载了一副厚重的躯体和一颗升腾的灵魂……

    ③澄净如练的碧波之上,渔夫喝酒划桨,一船楚歌一船潇洒。你何不也行吟泽畔,听渔歌唱晚,眺万顷碧波,载酒中流,心随水去?你何不“制芰荷以为裳”,“餐秋菊之落英”?或者你就生活在“九歌”的境界中,做一个“九歌”中的人物:浪漫、多情、而又诗意纵横文采斐然。何苦“举世皆浊”而“独清”,“众人皆醉”而“独醒”?你是知道的,尘秽鹊起,诸欲蜂扰,洁身净志是不合时宜的,而将内心的忧愤化为精神的火焰,尤为不合时宜。有高于一世之思想,却无高于一世之命运,这就是你的悲哀。一个真性情的人活在一个最冷酷的现实中,一个最洁净的人落在一个最肮脏的泥塘里,一个最遵循内心真实的人面对的是种种的虚伪和狡诈。你无法对他们宽容,哪怕是丁点儿的虚与委蛇,你谨持自己理想的绝对纯洁。“沧浪之水清兮,可以濯我缨;沧浪之水浊兮,可以濯我足”。世间至清至柔者,莫过于水。于是,你用沧浪清水浣濯自己的精神之“缨”,把生命托付清流,“质本洁来还洁去”。

    ④一个忠于自己,忠于自己的感受,忠于自己内心真实的人死去了,一腔最殷红的热血流失在汨罗河中,我们民族的一些真性情也被冲淡了。

    ⑤水能沐浴群生,扬清激浊。屈子自沉后两千多年,孤洁的王国维同样选择了天下之至柔的水。“思想而不自由毋宁死耳”,天命之年的王国维,茕茕向颐和园走来,仿佛疲惫劳顿后的从容归家。佛香阁排云殿下的昆明湖波平如镜,如钩的银月清辉宁静,苍苍大树无语肃然。湖水只有叹息,感叹一位已攀缘至文学批评与文艺美学巅峰的学者,一位通古博今、满腹经纶的名副其实的大师,在维护自己信仰时的那份悲壮情怀。他遗书的开头四句,无疑是他自沉原因的最准确的揭秘:“五十之年,只欠一死,经此世变,义无再辱。”卑鄙与高尚同在,清泉与污水混流。“义无再辱”,这是王国维全部的隐痛和决心。

    ⑥顾炎武在《日知录·廉耻》一则中说,“……士大夫之无耻,是谓国耻”,知义者必勇,知耻者必勇,勇于赴死,绰绰有余。作为革命家的陈天华,看到国家已堕落得毫无尊严可言,他义无再辱,赴身日本海;作为小说家、戏剧家的老舍,面对斯文扫地,面对“人民艺术家”转眼沦为牛鬼蛇神,他义无再辱,自沉积水潭。他们选择了死亡,而死亡让生命趋于完美,让生命更具尊严。

    ⑦千古悲欢,诉诸流水。信仰是灵魂的支撑,对一个刚直的文人来说,它比生命重要得多。当肉体的保存与精神的救赎发生避无可避的冲突时,他们毅然选择了后者,让肉体下沉,让精神在碧波中飞升。陈寅恪为王国维写的纪念碑铭这样写道:“先生之著述,或有时而不章。先生之学说,或有时而可商。惟此独立之精神,自由之思想,历千万祀,与天壤而同久,共三光而永光。”

    ⑧被鲁迅称为“中国的济慈”的诗人朱湘,在其《海葬》一诗中写道:“葬我在荷花池内/耳边有水蚓拖身/在绿荷叶的灯上/萤火虫时暗时明——葬我在泰山之巅/风声呜咽过孤松——不然,就烧我成灰/投入泛滥的春江/与落花一同漂去/无人知道的地方。”面对人生的悲辛、人心的冷酷,他亦赴身黄浦江中,以自己29岁的生命,完成了对信仰的至高无上的追求。

    ⑨宇宙透明,月光皎洁,星辰晶莹,皆因其长沐银河之水。《礼记》说:水曰清涤。向义无再辱的自沉者表示敬意吧,他们以绿水清流,做了自己的殓衣,漾荡了自己的精神。奔涌的碧水会托起他们皓洁的灵魂。