题干

n边形的边数每增加一条,其对角线增加(  )

A:n条

B:(n﹣1)条 

C:(n﹣2)条 

D:(n﹣3)条

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答案(点此获取答案解析)

B

同类题1

阅读下面的文言文,完成小题。
                                                                                                     (甲)
      初,权谓吕蒙曰:“卿今当涂掌事,不可不学!”蒙辞以军中多务。权曰:“孤岂欲卿治经为博士邪!但当涉猎,见往事耳。 卿言多务,孰若孤?孤常读书,自以为大有所益。蒙乃始就学。及鲁肃过寻阳,与蒙论议,大惊曰:“卿今者才略,非复吴下阿蒙!”蒙曰:“士别三日,即更刮目相待,大兄何见事之晚乎!”肃遂拜蒙母,结友而别。
                                                                                                     (乙)
      祖莹,字元珍,范阳遒人也。父季真,位中书侍郎、钜鹿太守。
      莹年八岁能诵《诗》《书》;十二为中书学生。耽书,父母恐其成疾,禁之不能止。
      常密于灰中藏火,驱逐僮仆,父母寝睡之后,燃火读书,以衣被蔽塞窗户,恐漏光明,为家人所觉。由是声誉甚盛,内外亲属呼为“圣小儿”。尤好属文,中书监高允每叹曰“此子才器,非诸生所及,终当远至。”
      时中书博士张天龙讲《尚书》,选为都讲。生徒悉集,莹夜读书劳倦,不觉天晓,催讲既切,遂误持同房生赵郡李孝怡《曲礼》卷上座。博士严毅,不敢还取,乃置《礼》于前,诵《尚书》三篇,不遗一字。 讲罢,孝怡异之,向博士说,举学尽惊。后高祖闻之,召入令诵五经章句,并陈大义,帝嗟赏之。以才名拜太学学士。

同类题5

阅读理解

    “Dad,” I say one day …..take a trip. Why don't you fly and meet me?”

    My father had just reired……….. His job filled his day, his thought, his life. While he woke up and took a warm shower, I screamed under a freezing waterfall Peru. While he tied a tie and put on the same Swiss watch, I rowed a boat across Lake of the Ozarks.

    My father sees me drfting aimlessly, nothing to show for my 33 years but a passport full of funny stamps. He wants me to settle down, but now I want him to find an adventure.

    He agrees to travel with me through the national parks. We meet four weeks later in Rapid City.

    “ What is our first stop?” asks my father.

    “What time is it?”

    “Still don't have a watch?”

    Less than an hour away is Mount Rushmore. As he stares up at the four Presidents carved in granite(), his mouth and eyes open slowly, like those of little boy.

    “Unbelievable,” he says, “How was this done?”

    A film in the information center shows sculptor Gutzon Borglum devoted 14 years to the sculpture and then left the final touches to his son.

We stare up and I ask myself, Would I ever devote my life to anything?

No directions, …… I always used to hear those words in my father's voice. Now I hear them in my own.

    The next day we're at Yellowstone National Park, where we have a picnic.

    “Did you ever travel with your dad? I ask.

    “Only once,” he says. “ I never spoke much with my father. We loved each other---but never said it. Whatever he could give me, he gave.”>

    The kast sebtebce----it's probably the same thing I's say about my father. And what I'd want my child to say about me.

    In Glacier National Park, my father says, “I've never seen water so blue.” I have, in several places of the world, I can keep traveling, I realize—— and maybe a regular job won't be as dull as I feared.

    Weeks after our trip, I call my father.

    “The photos from the trip are wonderful,” he says.” We have got to take another trip like that sometime.

    I tell him I've learn decided to settle down, and I'm wearing a watch.