题干

下列说法正确的是(   )

A:可逆反应达到化学平衡状态时,正、逆反应的速率都为0

B:催化剂可以使不起反应的物质发生反应

C:可以找到一种催化剂使水变成油

D:增大反应物的浓度、提高反应温度都能增大反应速率

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答案(点此获取答案解析)

D

同类题2

阅读理解

    If you're a high school student,you may tend to measure your self-worth based on your popularity and status.You may feel dejected or disappointed if you have a difficult time fitting in or if you lack the confidence to talk to others.If you want others to like you,you'll need to have a healthy understanding of how people think,what appeals to them and how you can gain their approval.There are four tips on how to be popular in high school.And if you are popular with your classmates,you can get many benefits from it.

    You must be yourself in order to gain any real popularity in high school.While imitation is the sincerest form of flattery(奉承),copying another's style and personality will have a negative effect on your popularity.If you're not comfortable enough to be yourself 100 percent of the time,others won't feel comfortable around you.If you establish your own style and finesse and stay true to yourself,popularity will soon follow.

    Make yourself approachable to appeal to others and be popular in high school.People love to be around others who are confident and ready to have a good time.Hold your head up high,keep your shoulders back,and smile as you walk with an air of confidence to instantly attract others and boost your popularity.

    Be friendly and kind to everyone you meet.It's not enough to gain the approval of the other popular students in your school.In order to gain real popularity,you'll need to be kind and polite to everyone you meet.Make an effort to talk to your classmates regardless of their popularity or economic status and try to develop friendships with them.The more people you appeal to,the more popular you'll become.

    Involve yourself in school activities that interest you.You can be popular in high school if you play an active role in your school's extracurricular activities(课外活动).The more you participate in group activities,the more popular you'll become.

同类题5

阅读下面的文字,完成下列小题

“酷”字口语流行之我见

    读了《对语言污染不能太宽容——从“ku”说起》(本文认为“酷”给人的第一印象是“冷酷,冷峻”与“顶刮刮”“棒”“帅气”不沾边。语言学界对不合规范的用语要坚决“亮黄牌”),有些不同意见,一吐为快。

    当前“酷”字口语的流行,我以为不是偶然的,虽然它和外来语“cool”的音译(省去了“l”)有关,但却是符合我国语文文字的发展规律的,它和开士米(cashmere)、猫步(catwalk)、秀(show)等属同一类语言现象,它比这一类词语更具汉语特色。

    “酷”字原来就一字多义。《现代汉语词典》和《辞海》都指出,它除了“残酷”等含义外,还有“极、甚”的含义。这后一含义并非自今日始。司马迁的《史记》中不仅有《酷吏列传》还有《司马相如传》,其中引用了司马相如的《上林赋》说,“芬芳讴郁,酷烈淑郁”,把浓烈的香气,形容到了极致。现今流行的口语“酷”不过是重新发掘了它的“非常”“顶级”“绝顶”的含义,并不是无源之水。

    根据宁子介先生的研究,“汉字由‘象形字’开端,最终大部分演变成会意字,内涵外衍,意气磅礴,十分逻辑化。”对“酷”字追本溯源,也许能找到它一字多义的演变规律性。

    东汉许慎的《说文解字》说,“酷,酒,厚味也,从本酉,告声。”“酷”的部首“酉” 今天作十二时辰之一解,古汉语则是和酒联系在一起的。“酉,八月黍成可为酿酒, 象古文酉之形,凡酉(酒)之属,皆从酉”(《说文解字》),酉字篆书写作“酉”象形盛酒之容器,内含八字,其意略为八月收获粮食可酿成美酒。看来“酷”最初大约是用来形容醇酒的香气和味道的,以后衍生出“极、甚”的含义也是顺理成章的。现今流行的口语“酷”虽受外来语的影响,也还是上述含义的延伸罢了。  

    “酷”字的另一义大约是“声旁”“告”的衍生物。“告”字篆书写作“告” “牛触人,角著横木,所以告人也,从口,从牛”(《说文解字》)。牛撞伤了人,从而发生纠纷,去“告”牛的主人,由此进一步衍生出残酷、冷酷等含义,也是合乎逻辑的。这大约就是宁子介先生所说的“内涵外衍”现象吧。当前“酷”字口语的流行并不会改变这种一字多义的状态,笔者以为不必作忧天之虑。

    对于此类语言现象,即通过外来语的影响,融合汉语字词的某些特点,使字词产生出某种新意,我们应采取什么态度呢?还是周洪波先生说得好,“我们应象对待新事物一样,对新词语抱着积极欢迎的态度,多些理解和宽容,少些大惊小怪”。“新词语用冒了并不可怕,如果语言僵化,词汇贫乏,那才是真正可怕和可悲的呢。”