题干

在2L容积不变的容器中,发生3A(g)+B(g)⇌2C(g)+2D(g)的反应.现通入3mol A和2.5mol B,5s内用C表示的反应速率为0.1mol•L﹣1•s﹣1,则5s时容器中A的物质的量浓度是(   )

A:0.75 mol•L﹣1

B:1.5 mol•L﹣1

C:2 mol•L﹣1

D:0.15 mol•L﹣1

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A

同类题4

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

How to Enjoy Life As a Teen

    The "best years of your life"? Maybe not, but you can learn to make the most of your high school days.

    Learn to appreciate small things. Whether it's having a computer, having friends, having a good supply of food, a bed to sleep on, family that loves you, having a decent education or simply being born in this world, value it. ____ Be happy, and life will reward you. Remember that these are the last few years you will be able to enjoy yourself without having to worry about the responsibility of an adult, but make sure you prepare yourself for when you do become one. When you actually become an adult, you'll learn to love that responsibility and you probably never want to go back.

    Choose your friends wisely. Unlike what many articles state, you don't have to be popular and have a gazillion friends to be happy. ____ Try to have friends that like you who you are, not just because you are wearing a certain brand of shoes or something like that. These are people who shop at the same store as you; not someone who will sympathize with you when your dog dies.

    Keep your grades up. ____ This also sets you up to get into a college you want to go to, which in turn prepares you for a career you will enjoy, improving your quality of life in the future. You'll get cheap car insurance as well if you have at least a B or A average.

    ____ Participating in clubs, activities, and sports increases your chances of meeting new friends. While you only need 4 or 5 close friends, that doesn't mean you shouldn't try to meet new people. Participating gives you something to do instead of sitting bored at home and wallowing in self-pity.

    Work at a job you can enjoy. Working is a great way co gain experience and to meet other people. ____ This will look great on your resume. If you can't find work, especially in this hard economic time, volunteer or make your own job.

A. Be sociable.

B. Remember the point of life is for you to enjoy it.

C. Find a hobby that is meaningful or practical.

D. In fact, many of the "friends" you have when you are popular are not true friends.

E. When you do get out of college, interviewing companies will look at your previous work experience.

F. Even though you want to enjoy your teen life as best as possible, don't idle away your time in school.

G. There is nothing more satisfying than seeing your hard work pay off in the form of A's and B's (but mainly A's).

同类题5

阅读下面的文字,完成下面题目。

宝物

    他的手机响了,是母亲打来的,母亲告诉他医院催着交钱。他说,知道了,并叫母亲不要着急。

    他坐车来到市区的一个叫着“王记”的古董行。

    你们这里收古董吗?顾林低声问正在电脑上忙着的一个男人。你有什么古董?王经理问。

    家中有一个宝物,顾林在8岁那年就知道了。宝物是一个瓷瓶。瓷瓶上画着一幅仕女图,人物栩栩如生,呼之欲出。

    他用手机对着瓷瓶各个角度拍了照片。

    顾林把手机上的照片翻给王经理看。

    瓷瓶现在在哪里?王经理问。

    在家里。

    不知道是真品还是赝品?王经理自言自语。

    应该是真品。顾林说。他有点心虚,其实他也不知道是真品还是赝品。母亲常对他说,那是你父亲一直为之骄傲的东西……

    王经理打了一个电话,一个穿着唐装的60多岁的老人从楼上下来。人们都喊他“老教授”,他曾是一所名牌大学的教授。

    顾林把手机送到老教授手里。老教授看到照片,眼睛突然睁大,后陷入深思,后又摇了摇头。

    刚才听犬子说瓷瓶在你家里?能方便去看看吗?老教授问。

    能。他说,不一定卖。

    不妨。去观赏观赏。你不卖也不妨。老教授说

    顾林啊,快点来啊,又催交钱了。母亲电话再一次打来。他连连说,知道了。

    胎骨薄匀,绘画细腻,不错。老教授看到瓷瓶说。

    老教授边看边摸。他时而嘴角露出一点微笑,时而蹙眉。

    太像了,老教授自言自语。你认识顾开庭吗?老教授问。

    是家父。他说。

    他人呢?老教授问。

    他住院了,急需要钱,不是这样我还不卖。您怎么知道家父的名字?

    有过一面之缘。你打算卖多少?

    3——30万,他说。

    老教授沉思片刻,说,好,30万就30万。

    到了古董店,老教授吩咐王经理付8万元现金给顾林,还开了一张22万元的支票,还亲自给他写了个条子。

    你怎么有这么多钱?母亲看到几捆钱后,惊奇地问。

    卖了瓷瓶。他如实说。

    也罢。你快去交钱,省得再催。重症病房花钱多。你爸还没醒转过来,这次受苦了。母亲说时眼里含着泪。那个撞了他之后逃逸的人不知道能不能查出来?

    应该能。顾林安慰母亲。

    两天后,父亲醒了过来。

    父亲出院后,问瓷瓶卖了多少钱。顾林说,30万元。

    父亲说,可以了。

    看过瓷瓶后,买家还提到你的名字。顾林说。

    他会认识我?不可能啊,这个瓷瓶的主人在江南啊,离这远着呢,而且又这么多年了。父亲说。

    年底的一天,顾林接到一个陌生的电话,约他到市黄海咖啡馆见面。

    是您?他一见面就认出老教授,陪同他的还有他的儿子王经理。

    看到你的瓷瓶,我太喜欢它了,无论是真品还是仿品,我无所谓,看到它亲切啊。老教授说,你知道你家怎么会有这个瓷瓶的?

    顾林说,我听母亲说,25年前,父亲在江南打工,在一个冬日里,他救了一个落水的孩子,还救了跳到水里救孩子的父亲。天冷,父亲自己差点送了命,这家是开古董店的,就送了这个瓷瓶,听母亲说父亲当时还不愿意要,嫌弃它不能吃,还易碎,人家开古董店的老板正好到江北有事,父亲带着瓷瓶顺便坐着人家雇的船回了家。

    你的父亲救了我和他啊。老教授指着王经理说。

    怎么这么巧?顾林笑着感叹。

    其实我那天一看到这个瓷瓶,我就感觉是以前送出去的那个瓷瓶。老教授说,当年我父亲在送瓷瓶之前,找人鉴定过的,说是后人仿造的,知道它并不值钱,可是当时我的家里的日子也不好过,我们还是把它送给你父亲。这些年我们一直愧疚啊,你父亲救了我家两条命,我们却给他一个不值钱的东西。为了这个瓷瓶,我们才在江北开了个分店,就想找到你父亲啊。

    原来是仿造的啊,那就不值钱了!顾林说。

    不是钱的事,老教授说。我们现在就去见你的父亲,瓷瓶我们也带来了,送出去的东西我们不敢再要回来。这次我找专家鉴定过了,是清代粉彩瓷真品。

    那值多少钱?顾林问。

    最少400万。

(选自《微型小说选刊》2014年第16期)