题干

牵牛花的茎可以缠绕在其他物体上生长,如果测量幼茎靠近物体的一侧和远离物体的一侧的生长素浓度会发现(   )

A:靠近物体的一侧高于远离物体的一侧

B:靠近物体的一侧低于远离物体的一侧

C:两侧的生长素浓度差不多

D:无法确定

上一题 下一题 0.0难度 选择题 更新时间:2015-05-25 03:57:14

答案(点此获取答案解析)

B

同类题2

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。

    Let children learn to judge their work.____.If corrected too much,he will stop talking.

    He notices a thousand times a day the difference between the language he uses and the language those around him use.Bit by bit,he makes the necessary changes to make his language like other people's.____.They learn to do without being taught to walk,run,climb,whistle,ride a bicycle.They compare their own performances with those of more skilled people,and slowly make the needed changes.

    But in school we never give a child a chance to find out his mistakes and correct them for himself.We do it all for him.____.Let him work out,with the help of other children if he wants,what this word says,what the answer is to that problem,and whether this is a good way of saying or doing this or not.

    If it is a matter of right answer,as it may be in mathematics or science,give him the answer book.____.Why should we teachers waste time on such routine work?____.Let the children learn what all educated people must some day learn,how to measure their own understanding,and how to know what they know or do not know.

A.Children learn to do all the other things in the same way.

B.Let him correct his own papers.

C.Point out his mistakes.

D.We act as if we thought that he would never notice a mistake unless it was pointed out to him,or correct it unless he was made to.

E.We allow him to learn from other children.

F.A child learning to talk does not learn by being corrected all the time.

G.Our job should be to help the child when he tells us that he can't find the way to get the right answer.

同类题3

阅读下文,回答问题。

最后的希望

    祥子昂着头,双手紧紧握住车把,眼放着光,迈着大步往前走;只顾得走,不管方向与目的地。他心中痛快,身上轻松,仿佛把自从娶了虎妞之后所有的倒霉一股拢总都喷在刘四爷身上。

    晚间的冷气削着他的脸,他不觉得冷,反倒痛快。街灯发着寒光,祥子心中觉得舒畅得发热,处处是光,照亮了自己的将来。半天没吸烟了,不想再吸,从此烟酒不动,祥子要重打鼓另开张,照旧去努力自强,今天战胜了刘四,永远战胜刘四;刘四的诅咒适足以教祥子更成功,更有希望。

    “祥子你得从此好好地干哪!”他嘱咐着自己,“干吗不好好地干呢?我有志气、有力量、年纪轻!”他替自己答辩:“心中一痛快,谁能拦得住祥子成家立业呢?把前些日子的事搁在谁身上,谁能高兴,谁能不往下溜?那全过去了,明天你们会看见一个新的祥子,比以前的还要好,好得多!”

    心一变,马上身子也强起来,不成问题!出了一身的汗,口中觉得渴,想喝口水,他这才觉出已到了后门。顾不得到茶馆去,他把车放在城门西的“停车处”,叫过提着大瓦壶,拿着黄砂碗的卖茶的小孩来,喝了两碗刷锅水似的茶;非常的难喝,可是他告诉自己,以后就得老喝这个,不能再都把钱花在好茶好饭上。这么决定好,爽性再吃点东西——不好往下咽的东西——就作为勤苦耐劳的新生活的开始。

    可是,上哪儿去呢?可以投奔的,可依靠的,人,在他心中,只有两个。打算努力自强,他得去找这两个——小福子与曹先生。

    谁知道曹先生回来没有呢?不要紧,明天到北长街去打听;那里打听不着,他会上左宅去问,只要找着曹先生,什么便都好办了。好吧,今天先去拉一晚上,明天去找曹先生;找到了他,再去看小福子,告诉她这个好消息:祥子并没混好,可是决定往好里混,咱们一同齐心努力地往前奔吧!

    这样计划好,他的眼亮得像个老鹰的眼,发着光向四外扫射,看见个座儿,他飞也似跑过去,还没讲好价钱便脱了大棉袄。跑起来,腿确是不似先前了,可是一股热气支撑着全身,他拼了命!祥子到底是祥子,祥子拼命跑,还是没有别人的份儿。见一辆,他开一辆,好像发了狂。汗痛快地往外流。跑完一趟,他觉得身上轻了许多,腿又有了那种弹力,还想再跑,像名马没有跑足,立定之后还踢腾着蹄儿那样。他一直跑到夜里一点才收车。回到厂中,除了车份,他还落下九毛多钱。

    一觉,他睡到了天亮;翻了个身,再睁开眼,太阳已上来老高。疲乏后的安息是最甜美的享受,起来伸了个懒腰,骨节都轻脆地响,胃中像完全空了,极想吃点什么。

    吃了点东西,他笑着告诉厂主:“歇一天,有事。”心中计算好:歇一天,把事情都办好,明天开始新的生活。

(《骆驼祥子》第二十二章,商务印书馆2012年版,有删改)