题干

下列选项中与所示概念图不相吻合的是(  )

A:a﹣核酸、b﹣DNA,c﹣核糖

B:a﹣原核生物、b﹣细菌、c﹣乳酸菌

C:a﹣糖类、b﹣二糖、c﹣麦芽糖

D:a﹣真核生物、b﹣真菌、c﹣酵母菌

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答案(点此获取答案解析)

A

同类题3

阅读理解

    When Jeanne Calment entered the world in 1875, telephones and automobiles still lay in the future. Albert Einstein and Pablo Picasso were not yet born. The Eiffel Tower was 14 years from being built. As a teenager, she met Vincent Van Gogh, near her home in Arles, in the south of France. He was “very ugly, ungracious, impolite, sick—I forgive him, they called him loco (精神失常的)”, she recalled. When she died last week at age 122, she was the world's eldest person. (There are others who claimed to the title, but only Calment had the official documents to prove her age.)

    Each February 21, her birthday, she would share the secrets of long life. Some years it was “a sense of humour”, others it was “keeping busy”. “God must have forgotten me,” she once explained. The truth probably was that her mother reportedly lived to be 86 and her father 94.

    Her life had its sadness: she outlived her husband, her only daughter and her grandson. According to a friend, she was imperturbable. “If you can't do anything about it,” she reportedly said, “don't worry about it.”

    In her last years she was nearly blind and deaf, but her health remained good. She ate a few bars of chocolate each week and continued smoking until a few years ago, when she could no longer light her own cigarettes. She never lost her sense of humour. On her 110th birthday, she commented, “I've only ever had one wrinkle, and I'm sitting on it. “Her longevity made her famous; her spirit made her eternal (永恒的).

同类题5

阅读下文,完成1-3题。


做数字时代的“责任公民”

佚名

①互联网应用的快速普及,无疑是近年来最让人瞩目的现象。亿万人聚于网络,成为推动社会改变、时代前行的力量。如果没有网络技术的迅猛发展,没有无数人充满智慧与激情的创造,就没有众多活跃的粉丝,也就不会有今天这个数字时代无比繁盛的网络文化。

②可是,如今的网络生活,负面新闻几乎每天可见:电子商务遭遇盗窃与失信,医疗网购夹带假药害人,信息畅流侵犯他人隐私,造谣传谣带来网络暴力……正因如此,那些搭建平台开发技术的公司,那些提供内容的网站,那些粉丝众多颇有影响的微博大V以及现有的6亿多中国网民,都应该成为网络生活的“责任公民”。

③作为技术支持者,需要保有技术层面的职业操守。电商企业将假冒伪劣商品清理出自己的平台,是责无旁贷的义务。搜索引擎以“价高者往前排”的标准提供信息服务,自然会被诟病。那些放任虚假、庸俗信息泛滥以博取眼球者,更是触碰了法律的红线。对于数字时代的“企业公民”,维持网络空间的清爽,保证虚拟世界的安全,应该是底线责任。而以模式创新激发网络活力,以主动姿态参与社会生活,则是更高层面的要求。

④作为内容提供者,需要把握            。如果一味屈从点击率,盲目追求阅读量,只会陷入“劣币驱逐良币”的恶性循环,最终把“做内容”变成“拼底线”。文化产品的提供者们,需要保持正确的审美和价值取向,在兼顾人们需求的同时,以更高远的眼界开拓更丰富的资源,不被虚荣心和功利心牵着鼻子走。

⑤同样,无论是微博大V,还是普通网民,都可以充当自媒体的角色,也需要遵从媒体伦理,涵养信息时代的精神和心灵。

⑥对于互联网管理工作来说,这两年是立规矩、讲规矩的关键阶段。我国已建构起自律、他律、互律三种协同机制,但互联网未知远远大于已知,规则、道德在新的领域树立非一日之功。此时,更需激发、督促数字时代的“责任公民”,以更多集体意识和担当精神,去维护清朗、健康、生机勃勃的网络家园。

 ⑦“我们都有家,都愿家整洁。入目皆芷荷,扑鼻是芝兰。听曲有妙音,访谈有益友。虽隔千里外,网络一线牵”,有人用这样的诗句表达对互联网的希冀。由此,做数字时代的“责任公民”,应是我们共同的追求。

(选自《人民日报》2015年3月3日,有删改)