题干

如图表示某种酶在不同处理条件(a.b.c)下催化某反应物的量和反应时间的关系,解读此图可获得的信息是(  )

A:a、b、c表示温度,则一定是 a>b>c

B:a、b、c表示酶的浓度,则 a>b>c

C:a、b、c表示底物的浓度,则a>b>c

D:a、b、c表示PH,则不可能是a>b>c

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B

同类题2

阅读理解

    If you want to become a better reader, what should you know about speed of reading?

    Some people read very rapidly(快速地),while others read very slowly. But which one is better?

    The rapid reader may be a good reader when he reads a storybook for fun. But he may not be able to slow down enough to read directions carefully. He may read so rapidly that he does not take time to understand fully the ideas and information which are important to remember.

    The slow reader may be a good reader when he reads directions for making something. But he may spend too much time in reading a simple story which is meant to be enjoyed but is not important enough to be remembered.

    So, you see, either a rapid reader or a slow reader is not really a good one. If you wish to become a better reader, here are four important things to remember about speed of reading.

    1  Knowing why you are reading will often help you to know whether to read rapidly or slowly.

    2  Some things should be read slowly throughout. Examples are directions for making or doing something, science and history books, and Maths problems. You must read such things slowly or remember each important step and understand each important idea.

    3  Some things should be read rapidly throughout. Examples are simple stories for enjoyment, letters from friends and bits of news from hometown papers.

    4  In some of your reading, you must change your speed from fast to slow and slow to fast, as you go along. You will need to read certain pages rapidly and then slow down and do more careful reading when you come to important ideas.

同类题5

阅读下面的文言文,完成文后各题。

    何承矩字正则。幼为棣州衙内指挥使,从继筠讨刘崇,擒其将胡澄以献,论功授闲厩副使。太平兴国五年,知河南府。时调丁男百十辈转送上供纲,承矩以为横役,奏罢其事。徙知潭州,疏为政之害民者数十事上之,悉被容纳。凡六年,囹圄屡空,诏嘉奖之。米信知沧州,以其不习吏事,命承矩知节度副使,实专郡治。时契丹挠边,承矩上疏曰:“若于顺安砦西开易河蒲口,导水东注于海,资其陂泽,筑堤贮水为屯田,可以遏敌骑之奔轶。其无水田处,亦望选兵戍之,简其精锐,去其冗缪。”太宗嘉纳之。属霖雨为灾,典者多议其非便。承矩引援汉、唐屯田故事,以折众论。乃以承矩为制置河北缘边屯田使,俾董其役。由是自顺安以东濒海,广袤数百里,悉为稻田,民赖其利。

    淳化四年,擢知雄州。契丹精骑数千夜袭城下,伐鼓纵火,以逼楼堞。承矩整兵出拒,迟明,列阵酣战久之,斩馘甚众,契丹遁去。秩满,召还,拜引进史。州民百余谒阙贡马,乞借留承矩,赐金紫,诏许再任。真宗嗣位,以事有缓急,难于匀济,命承矩为四路都转运使,要切之务,俾同规画。丁内艰,时以边兵稍息,农政未修,起复授置缘边安抚使,且诏边民诱其复业。承矩曰:“契丹闻之,必谓诱其部属也。”乃易诏文为水旱流民之意。王钦若时知枢密援汉虫达周仲居改诏请罪承矩帝曰承矩任边有功当优假之第诏自今朝旨未便者奏禀进止。

景德元年,入朝,进领英州团练使。时议防秋北鄙,承矩犹屡表请行,上以其老闵之,不许。三年卒,年六十一。特赠相州观察使,赙钱五十万,绢五百匹,中使护葬。

(选自《宋史·列传三十四》,有删节)