题干

下列有关细胞共性的叙述,正确的是(    )

A:都具有细胞膜但不一定具有磷脂双分子层

B:都具有细胞核但遗传物质不一定是DNA

C:都能进行细胞呼吸但不一定发生在线粒体中

D:都能合成蛋白质但合成场所不一定是核糖体

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答案(点此获取答案解析)

C

同类题1

阅读下面文段,解答各题

                                   《郑当时传》

       郑当时者,字庄,陈人也。其先郑君尝为项籍将,籍死,已而属汉。高祖令诸故项籍臣名籍,郑君独不奉诏。诏尽拜名籍者为大夫,而逐郑君。

  郑庄以任侠自喜,脱张羽于厄,声闻梁楚之间。孝景时,为太子舍人。每五日洗沐①,常置驿马长安诸郊,存诸故人,请谢宾客,夜以继日,至其明旦,常恐不遍。庄好黄老之言,其慕长者,如恐不见。年小官薄,然其游知交,皆其大父行,天下有名之士也。武帝立,庄稍迁为鲁中尉、济南太守、江都相,至九卿为右内史。以武安侯、魏其时议,贬秩为詹事,迁为大农令。

  庄为太史,诫门下:“客至,无贵贱,无留门者。”执宾主之礼,以其贵下人。庄廉,又不治其产业,仰奉赐以给诸公。然其馈遗人,不过算②器食。每朝,候上之间说,未尝不言天下之长者。其推毂③士及官属丞史,诚有味其言之也,常引以为贤于己。未尝名吏,与官属言,若恐伤之。闻人之善言,进之上,唯恐后。山东士诸公以此翕然称郑庄。

  郑庄使视决河,自请治行五日。上曰:“吾闻‘郑庄行,千里不赍粮',请治行者何也?”然郑庄在朝,常趋和承意,不敢甚引当否。及晚节,汉征匈奴,招四夷,天下费多,财用益匮。庄任人宾客为大农僦人④,多逋负⑤。司马安为淮阳太守,发其事,庄以此陷罪,赎为庶人。顷之,守长史。上以为老,以庄为汝南太守。数岁,以官卒。卒后家无余赀财。

注:①洗沐:官员休假 ②算:竹器 ③推毂:推荐 ④僦人:这里指承揽运输的人⑤逋负:拖欠款项用。简介的语言概括分析文段的意思。

同类题5

阅读理解

    Jia Zuosheng, 27, used to work as a security guard (保安) at the library of Tsinghua University. But a few months ago, he became a college student in Lishan College in Shandong and he studies math there now. When hearing this news, many people were surprised. On school opening day, many reporters waited outside the school gate to interview him.

    “I was born in a poor village in Shandong Province," said Jia. "Our village has never had a college student. Most boys work in town after growing up. I failed the National College Entrance Exam(高考)twice. Then I went to Beijing to find jobs. In the following years, I went on studying by myself while working.”

    At the end of 2009, Jia found a job as a security guard at the library of Tsinghua University.“I cherished (珍惜) the job very much because it gave me a good chance to read books," Jia said.“I usually worked at night so I had plenty of time to study in the daytime.” When he had problems that he couldn't work out, Jia asked the students at Tsinghua for help. "My dream is to be a college teacher. So I need further education. That's the reason why I took the National College Entrance Exam again," Jia said. “I wish to educate students with my knowledge and love and help them enjoy true, kind and beautiful things.”

    Jia's mother said Jia has always been independent(独立的)and knows what he wants. But she has other worries. "It's difficult to find such a good job at present as a library guard in Tsinghua University. I'm not sure if this is a right decision.” “I will never regret(后悔),”said Jia. "Everyone will have a new start. It's the end, and the beginning.”