题干

下列各组物质中,互为同系物的是(  )

A:与

B:HCOOCH3与CH3COOCH3

C:与CH3—CH=CH2

D:CH3OH与HO—CH2—CH2—OH

上一题 下一题 0.0难度 选择题 更新时间:2010-08-03 08:59:46

答案(点此获取答案解析)

B

同类题3

阅读《社戏》选段,完成小题。
        我的很重的心忽而轻松了,身体也似乎舒展到说不出的大。一出门,便望见月下的平桥内泊着一只白篷的航船,大家跳下船,双喜拔前篙,阿发拔后篙,年幼的都陪我坐在舱中,较大的聚在船尾。母亲送出来吩咐“要小心”的时候,我们已经点开船,在桥石上一磕,退后几尺,即又上前出了桥。于是架起两支橹,一支两人,一里一换,有说笑的,有嚷的,夹着潺潺的船头激水的声音,在左右都是碧绿的豆麦田地的河流中,飞一般径向赵庄前进了。
        两岸的豆麦和河底的水草所发散出来的清香,夹杂在水气中扑面的吹来;月色便朦胧在这水气里。淡黑的起伏的连山,仿佛是踊跃的铁的兽脊似的,都远远地向船尾去了,但我却还以为船慢。他们换了四回手,渐望见依稀的赵庄,而且似乎听到歌吹了,还有几点火,料想便是戏台,但或者也许是渔火。
那声音大概是横笛,宛转,悠扬,使我的心也沉静,然而又自失起来,觉得要和他弥散在含着豆麦蕴藻之香的夜气里。
        那火接近了,果然是渔火,我才记得先前望见的也不是赵庄。那是正对船头的一丛松柏林,我去年也曾经去游玩过,还看见破的石马倒在地下,一个石羊蹲着在草里呢。过了那林,船便弯进了叉港,于是赵庄便真在眼前了。

同类题5

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。

Dear Seth,

    You are only three years old, and at this point in your life you are not able to understand this letter. But some day when you 1 , I hope you will find something 2 in what I am going to share with you.

    Life can be 3.There will be people in your life who won't be very nice. They'll 4 you because you are different, 5 for no good reason. You will also face heartbreak and might be 6 by those you love. I hope you don't have to face these too much. But such things 7 .

    Be open to life anyway. You'll find cruelty(残忍) and 8 in your journey through life, but don't let that 9 you from finding new things. Don't retreat(退却) from life, and don't 10 or wall yourself off. Be open to new things, new experiences and new people. You will 11 many times, but if you allow that to stop you from trying, you will 12 many chances. Do remember failure is a stepping stone to 13.

    You will meet many people who will try to do 14 than you, in school, in college, and at work. They'll try to have nicer cars, bigger houses, nicer clothes, and so on… To 15, life is a competition. However, I believe life is a 16. If you always try your best to17 others, you are wasting your life. Learn to enjoy your life 18 and you will make it a journey of 19 of learning and of love.

    Finally, know that I love you and always will. You are 20 a really wonderful journey, and I will always be there for you.

Love,

Dad