题干

下列反应中前者属于取代反应,后者属于加成反应的是(   )

A:甲烷与氯气混和后光照反应;乙烯使酸性高锰酸钾溶液的褪色

B:乙烯与溴的四氯化碳溶液反应;苯与氢气在一定条件下反应生成环己烷

C:苯与浓硝酸和浓硫酸的混合液反应生成油状液体;乙烯与水生成乙醇的反应

D:乙烯与溴水反应;乙酸与乙醇的酯化反应

上一题 下一题 0.0难度 选择题 更新时间:2018-03-19 05:02:44

答案(点此获取答案解析)

C

同类题1

阅读理解

    The value-packed, all-inclusive sight-seeing package that combines the best of Sydney's harbour, city, bay and beach highlights.

    A SydneyPass gives you unlimited and flexible travel on the Explorer Buses: the 'red' Sydney Explorer shows you around our exciting city sights while the ‘blue' Bondi Explorer visits Sydney Harbour bays and famous beaches. Take to the water on one of three magnificent daily harbour cruises (游船). You can also travel free on regular Sydney Buses, Sydney Ferries or CityRail services (limited area), so you can go to every corner of this beautiful city.

    Imagine browsing at Darling Harbour, sampling the famous seafood at Watsons Bay or enjoying the city lights on an evening ferry cruise. The possibilities and plans are endless with a SydneyPass. Wherever you decide to go, remember that bookings are not required on any of our services so tickets are treated on a first in, first seated basis.

    SydneyPasses are available for 3, 5 or 7 days for use over a 7-calendar-day period. With a 3 or 5-day pass you choose on which days out of the 7 you want to use it. All SydneyPasses include a free Airport Express inward trip before starting your 3, 5 or 7 days, and the return trip is valid (有效的) for 2 months from the first day your ticket was used.

SydneyPass Fares


Adult

Child*

Family**

3-day ticket

$90

$45

$225

5-day ticket

$120

$60

$300

7-day ticket

$140

$70

$350

    *A child is defined as anyone from the ages of 4 years to under 16 years. Children under 4 years travel free.

    **A family is defined as 2 adults and any number of children from 4 to under 16 years of age from the same family.

同类题2

阅读下文,回答问题

让有些话穿耳而过

    ①李肇星曾在一篇文章中记述了他儿子3岁时的一些充满意趣的奇言妙语。有次他儿子在回答“人为什么会长两只耳朵”时说:“可以一个耳朵进,一个耳朵出,光进不出就会装不下。”

    ②由此,我想起了一句话:让有些话穿耳而过。

    ③譬如某一天,你无意中听到一些诽谤和中伤你的话语,就让它穿耳而过。那也许是别人对你某一个不经意的行为、某一句不经意的话产生了误解。你要相信,浊者自浊,清者自清,只要假以时日,他一定会看出你的初衷与本真。于是你便拥有了一颗平静安宁的心。

    ④如果偶尔听到有人指责你太不细心,未能做到未雨绸缪、防微杜渐,要让它穿耳而过。尽管他的指责是善意的,可是在这个世界上,每个人都是渺小的,谁也不能保证自己不踏入认识上的歧途。不要太过相信“人无远虑,必有近忧”的话,无论自己对将来有多少设想,可它终究没有发生。最为紧要的是要抓住今天,认认真真活在当下。如此,才会在有限的生命中不为一些似是而非的东西浪费自己宝贵的光阴,才会不为那些旁逸斜出的枝杈失去自己的吟咏与歌唱。你才能听到妻儿的欢声笑语,才能淋浴到金色的夕阳、绚烂的晚照。即便风雨骤然而至,也依然轻裘绶带,玉树临风。

    ⑤如果有人说你才貌双全,要让它穿耳而过。那才华学识本是天外有天、山外有山,那形貌亦是父母的遗传并非自己的努力,原本不值得他人夸奖。

    ⑥如果有人说你出类拔萃,却白璧微瑕,也要让它穿耳而过。是否出类拔萃姑且不说,不完美本是人生的一种常态,如此,你就能摆脱“一次失败就成永远颓势”的阴影,就能走出“局部不完美就泛滥成整体否定”的误区,就始终能保持清醒的头脑。

    ⑦对于一些冷漠无情或者耍小聪明的话,对于一些玩世不恭,不知轻重的话,对于一些上下之势、高低权争、男女绯闻的话,都要让它穿耳而过。这样,你就会秋波无痕,素心如玉。纵然那些对你有用,却让你智所不能逮、力所不能及,以致褫夺了幸福与快乐的话语,就要让它们穿耳而过,随风而逝。

    ⑧人生是一个容器,可这个容器的容量实在是非常有限。愁苦与畏惧多了,欢乐与勇气就少了;局促与紧张多了,潇洒与轻松就少了;傲慢与骄矜多了,恭谨与谦虚就少了。一些不需要的话语存放太多了,一些箴言就会无处落脚。让有些话穿耳而过。