题干

下列物质中最简式相同,但既不是同系物,也不是同分异构体的是(   )

A:CH3CH=CH2和

B:乙炔和苯

C: 和

D:葡萄糖与麦芽糖

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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,回答问题。

    宋学士濂,洪武①中以文学承宠渥②最久,后以老致仕③,每值万寿节④则来京贺,上与宴,恩数犹洽⑤。一日,与登文楼,楼峻,陟⑥级踬⑦焉。上日:“先生老矣,明年可无来。”濂稽首⑧谢。至明年万寿节前数日,上曰:“宋先生其来乎?”盖忘前语也。久之不至,曰:“其阻风乎?”使使视之江口,不至。日:“其有疾乎?”使使视之家,濂方与乡人会饮赋诗。上闻大怒,命即其家斩之。已而,入官。上食,孝慈⑨命左右置蔬膳于侧,上问:“后何为食蔬?”日:“闻宋先生今日赐死,故为蔬食,以资冥福。”上感悟,遽起,命驾前双马驰赦之,日:“不及罪死。”会前使阻风钱塘江,稍得延,后使至则已绑至市矣,宣诏得免。久之,其孙慎⑩获罪,复执来京,将杀之。后复力救曰:“田舍翁请一先生尚有终始,濂教太子诸玉》珂无师傅之恩?且濂居家,必不知情。”乃免。

(选自明·王鏊《王文恪公笔记》,有删减)

【注】①洪武:明太祖(朱元璋)年号。②宠渥:皇帝的宠爱与恩泽。③致仕:交还官职,即辞官。④万寿节:古代君主的生日。⑤恩数犹洽:依然蒙受皇恩j⑥陟:登。⑦踬:跌倒。⑧稽首:跪拜礼,常为臣子拜见君主时所用。⑨孝慈:即孝慈皇后,明太祖朱元璋的结发妻子。⑩冥福:迷信的人指死者在阴闽所享之福。⑩慎:人名,指宋慎。

同类题5

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    As a child, I started learning to play the piano, my favorite musical 1 but I was forced to give up when I started my middle school2 I could concentrate more on my studies.

    It's one of my biggest3 to stop practicing the piano when I recall sadly today. During the following years, I kept telling my piano teacher that I would4However, I didn't keep my promise because I was 5 with my study6 I lost touch with my teacher. Some years later, my teacher died. I was very sad because I lost such a good teacher. She was a very warm and gentle person. It hurts me to think she may have been 7 that I never returned. I haven't taken lessons since then but to be honest, I 8 to. Sitting at the piano, I couldn't help recalling many 9 ---times of my practising at home and playing before my teacher and one time my teacher 10 me after I played entire pieces of music wrong in front of her colleagues. I was so 11 that I could hardly say anything. But her 12helped ease my shame. These memories13good or bad, never caused my14 for playing the piano again.

    This thought then led me to think that 15 is like music, and that we all try to play different 16 in the instrument of our life. Sometimes the pitch (音高) is17when we play it well, but sometimes we are out of tone. However, we all continue to create our own 18style of music. No matter what style our music is, it is 19 that we sing the songs of joy, quietness and love. Though I may never make it back to piano lessons, it doesn't 20 that I've stopped making music.