题干

结晶牛胰岛素(一种蛋白质)的人工合成反映了我国在生命起源问题上取得了重大成果.它可以为生命起源的化学进化过程提供证据.它能证明的生命进化阶段是(  )

A:从无机小分子物质生成简单的有机物

B:从简单的有机物形成复杂的有机物

C:从复杂的有机物形成更为复杂的多分子体系

D:从复杂的多分子体系演变为原始细胞

上一题 下一题 0.0难度 选择题 更新时间:2018-04-29 02:37:18

答案(点此获取答案解析)

B

同类题4

阅读下面短文,然后从各题所给的四个选项中选出一个最佳答案。

    My mom keeps asking what's going on at school, if I'm going to audition(试演)for a party, why I didn't try out for the female lead, what my friends are doing, and so on. It's 1 and sometimes it's like she doesn't trust me. How can I get her to 2?-Katie Many teenagers have the same 3 as Katie. They think it difficult to 4well with their parents. However, if you try another way, you can make a 5 . Parents seem to like6about your day. If you don't share or talk7with your parents, they might feel the need to ask you questions. It might seem that they're prying into(打听)your business, but they're probably just trying to keep your relationship8. In fact, parenting experts often9parents to form a good relationship with their kids by asking about what's going on in their lives. Some parents do this better than 10, of course.(And, unfortunately, some parents do ask questions because they don't trust their kids, especially if their kids have been in 11 .So start by trying to give your parents the benefit of the doubt. Maybe they're just trying to stay 12 because they love and care about you. That doesn't make the questions any less annoying, 13. If you're tired of so many questions about your day, 14 the tables – ask your parents questions and use it as a way to practice your good listening skills. 15 tell them about your day before they ask. If you offer more information, conversations with your parents won't have so many questions.

同类题5

阅读下面的文言文,完成小题。

    人君之欲平治天下而垂荣名者,必尊贤而下士。夫朝无贤人,犹鸿鹄之无羽翼也,虽有千里之望,犹不能其意之所欲至矣;是故江海者托于船,致远道者托于乘,欲霸王者托于贤。是故吕尚聘,而天下知商将亡,而周之王也;管夷吾、百里奚任,而天下知齐、秦之必霸也。纣用恶来,齐用苏秦,秦用赵高,而天下知其亡也。

    齐景公伐宋,至于岐堤之上,登高望,太息而叹曰:“昔我先君桓公,长毂八百乘以霸诸侯,今我长毂三千乘,而不敢久处于此者,岂其无管仲欤!”弦章对曰:“臣闻之,水广鱼大,君明则臣忠;昔有桓公,故有管仲;今桓公在此,则车下之臣尽管仲也。”

    杨因见赵简主曰:“臣居乡三逐,事君五去,闻君好士,故走来见。”简主闻之,绝食而叹,跽而行,左右进谏曰:“居乡三逐,是不容众也;事君五去,是不忠上也。今君有士见过人矣。”简主曰:“子不知也。夫美女者丑妇之仇也盛德之士乱世所疏也正直之行邪枉所憎也。”遂出见之,授以为相,而国大治。

    子路问于孔子曰:“治国何如?”孔子曰:“在于尊贤而贱不肖。”子路曰:“范中行氏尊贤而贱不肖,亡何也?”曰:“范中行氏尊贤而不能用也,不肖而不能去也;贤者知其不己用而怨之,不肖者知其贱己而雠之。贤者怨之,不肖者雠之;怨并前,中行氏虽欲无亡,得乎?”

    无常安之国,无恒治之民;得贤者则安昌,失之者则危亡,自古及今,未有不然者也。明镜所以昭形也,往古所以知今也。夫知恶往古之所以危亡,而不务袭迹于其所以安昌,则未有异乎却走而求逮前人也

(节选自刘向《说苑·卷八·尊贤》,有删改)