题干

如图,在四棱锥 SABCD 中,二面角 SADB 的大小为90°, AB//CDDCB=1350AB=CD=DS=2AD=2AS=22DE=EC,SF=λSB(0<λ<1)
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同类题2

阅读下面短文,掌握其大意,然后从41-60各题所给的四个选项(A、B、C、D)中,选出最佳选项。

    Mrs. Jones was over eighty, but she still drove her old car like a woman half her age. She loved driving very fast, and was proud of the fact 1 she had never, in her thirty-five years of driving, been punished 2 a driving offence (犯规,犯法).

    Then one day she nearly3 her record. A police car 4 her, and the policemen in it saw her5 a red light without stopping. Of course, she was stopped. It seemed 6 that she would be punished.

    7 Mrs. Jones came up to the judge, he looked at her seriously and said that she was  8 old to drive a car, and that the 9 why she had not stopped at the red 10was most probably that her eyes had become weak 11 old age, so that she had simply not seen it.

    When the judge had finished what he was 12, Mrs. Jones opened the big handbag she was 13 and took out her sewing. Without saying a word, she 14 a needle with a very small eye, and threaded it at her first attempt.

    When she had 15 done this, she took the thread out of the needle again and handed 16 the needle and the thread to the judge, saying, “Now it is your 17I suppose you drive a car, and that you are quite sure about your own eyesight.”

    The judge took the 18 and tried to thread it. After half a dozen tries, he had still not succeeded. The case (案例) against Mrs. Jones was19, and her record20 unbroken.

同类题4

阅读下面文言文,完成下列小题。

【甲】隆中对

       亮躬耕陇亩,好为《梁父吟》。身长八尺,每自比于管仲、乐毅,时人莫之许也。惟博陵崔州平、颍川徐庶元直与亮友善,谓为信然。

       时先主屯新野。徐庶见先主,先主器之,谓先主曰:“诸葛孔明者,卧龙也,将军岂愿见之乎?”先主曰:“君与俱来。”庶曰:“此人可就见,不可屈致也。将军宜枉驾顾之。”

       由是先主遂诣亮,凡三往,乃见。因屏人曰:“汉室倾颓,奸臣窃命,主上蒙尘。孤不度德量力,欲信大义于天下,而智术浅短,遂用猖蹶,至于今日。然志犹未已,君谓计将安出?”

(节选自陈寿《隆中对》)

【乙】高帝求贤诏

       盖闻王者莫高于周文,伯者莫高于齐桓,皆待贤人而成名。今天下贤者智能,岂特古之人乎?患在人主不交故也,士奚由进?今吾以天之灵、贤士大夫定有天下,以为一家,欲其长久世世奉宗庙亡绝也。贤人已与我共平之矣,而不与吾共安利之,可乎?贤士大夫有肯从我游者,吾能尊显之。布告天下,使明知朕意。御史大夫昌下相国,相国酂侯下诸侯王,御史中执法下郡守。其有意称明德者,必身劝为之驾,遣诣相国府,署行、义、年。有而弗言,觉免。年老癃病,勿遣。

(选自《古文观止》)

      【注】①伯:同“霸”。②游:交游。“从我游”即参加治理天下。③昌:周昌,跟从刘邦入关破秦,建汉后为御史大夫,封汾阴侯。④酂侯:即萧何。曾为沛县吏,秦末佐刘邦起义。在楚汉战争中有大功,官居丞相,封酂侯。⑤御史中执法:即御史中丞。御史大夫的副手。⑥义:同“仪”,指仪表,包括身材尺寸、肤色。⑦癃(lóng)病:手足不灵活的病。