题干

X、Y、Z是三个相邻的植物细胞,已知Z细胞液浓度>Y细胞液浓度>X细胞液浓度。下列各图中能正确表示三者吸失水关系的是(  )

A:

B:

C:

D:

上一题 下一题 0.0难度 选择题 更新时间:2020-01-11 06:51:31

答案(点此获取答案解析)

D

同类题2



Dear Reader,
    Imagine an 11-year old girl whose days are often spent washing clothes, looking after a baby, working hard in the field.
    Imagine a little girl who knows there will not be enough food for dinner, who can't fill her stomach with water because it's polluted, and who has watched life slip away from her father, little brother and sister because the family is too poor to see a doctor.
    Is it hard to believe? For Maria Pastora, these are the real life.
    Maria would gladly walk miles to school, but her mother, now alone, needs her badly at home. If Maria grows up without any schooling, what will be her future?
    But for just 52 pennies a day, you can sponsor a child like Maria. Through “Save the Children”, you can help Maria’s mother get the tools and ways she needs to turn their poor food into a good dinner and the money she needs to buy clothes and school things for Maria.
To help Maria most, your money is put together with that of other sponsors, so hard-working people can help themselves. Build a school, a hospital…bring in clean water. This is what “Save the Children” has been about since 1932.
    For you there are many rewards. Have the chance to write to or hear from your sponsored child. Receive photos or progress reports. Know you are reaching out to another person. Not with a handout(施舍物), but a “handup”. That's how “Save the Children” works. But without you, it can't work. Please take a moment now to fill in and post the form below to help a child like Maria and her village.
It can make such a difference in her life and yours.

同类题4

阅读下面的文字,完成下列问题。

篱笆青青

    ①篱笆青青,来自乡村的深处,青绿着,蜿蜒着,逶迤着,像一条绿色的丝带,拴住乡村的暖,拴住庄户人家的脚步,拴住千里万里之外游子的心房。你见过山的险峻,见过海的宽广,不一定就见过一围小小的篱笆,纤细,温柔,一如母亲慈爱的眼神。

    ②一丛篱笆,可能是一段小小的竹林。青青的叶子,细细的竹节,繁密或稀疏的枝条,透过去,能看见鸡的逡巡,鸭的悠闲;或者还有一条狗戒备的眼神。忽而,篱笆深处闪过一位朴实的面孔,和蔼的女主人会用浓浓的方言问你:渴了?还是累了,要歇歇脚?庄户人家的日子散乱,不过水是甜甜的。没错,甜津津,凉丝丝,你不要介意隔着竹篱递过来的青瓷大碗,井拔的凉水混着竹的清新沁人心脾。

    ③竹篱内外,陌生也变得如此温馨。

    ④一丛篱笆可能是一棵棵紧密相连的花椒树。尖尖的针刺均匀分布在相互交错的枝桠间,不挡风,不挡雨,却可以忠实守护好自家的小院。院子里的枣树挂满了果儿,红的青的真好看,馋煞了几个调皮的乡下小子,商商量量围着花椒树篱笆转了好几圈儿,就是没找到一个可以下手的地方。这些,树篱都看见了,只是不想说,但等八月十五的当口,卸枣果儿,主人自会提了满满一篮子,东家西家,左邻右舍,哪个乡下的捣蛋鬼都能咀嚼上甜丝丝脆生生的大红枣。

    ⑤花椒树上已然挂满了一嘟噜一嘟噜的小花椒,红红的,在秋风里飘着麻酥酥的香味儿。

    ⑥一丛篱笆可能是一串长长的豆角丝瓜架。父亲随便插了一圈小木棍,母亲在春天点上了种子。单等着春风吹,单等着夏雨下,长长的木篱笆上开满了花。有吊瓜花,有丝瓜花,有紫红如梅朵的梅豆花。要不人说乡下的母亲辛苦呢﹣﹣见缝插针地打扮了一下,就给小小的农家小院牵来一篱笆美丽的花。蜜蜂嗡嗡飞,蝴蝶对对舞,偶尔有一只小虫子躲在花篱的深处,弹奏起柔柔的丝弦。

    ⑦繁花锦簇的木篱笆是母性乡村优雅的蕾丝花边,掩映间,羞怯不语。

    ⑧初夏,一声鸡啼啄破了黎明,一刹时乡村沐浴着七彩云霞,鸟儿们在篱笆上唱起了情歌,歌声婉转,流淌着多情的音符。你从散发着草儿香气的梦里醒来,绕着青青的篱笆看了又看,像在读一首清新的田园诗,像在听一支古典的乡情曲。

    ⑨秋天,你怎能拒绝篱笆上面青青红红的果实?长长的丝瓜,爬一路结一路,点缀其间;紫红的梅豆,站在最高处,像一枚枚飘扬在风中的旗帜。母亲呢,正忙着招呼路过篱笆门前的大娘婶子:“多摘点,多摘点,你看这篱笆要压塌了呢!”

    ⑩轻轻地,当我的眼神再次抚摸青青的篱笆,刚好暮色渐浓。一弯新月升起在村庄的上空,皎洁的月光洒在屋檐上,流泻在安静的庭院中,穿过岁月那围篱笆青青,投影在我安静的思绪里。这一生,是不是我也会拥有自己的篱墙,一丛青青的竹,或一排密密的小树,抑或一条开满春天的花墙,清与浊,真与假,善与恶,都不会轻易逾越。

(选自《散文》2010年第4期,有删改)