题干

具有膜结构的细胞器是

A:高尔基体和溶酶体

B:细胞膜和细胞核

C:中心体和纺锤体

D:核糖体和内质网

上一题 下一题 0.0难度 选择题 更新时间:2018-07-21 09:08:25

答案(点此获取答案解析)

A

同类题2

阅读下文,完成下列各题。

冬 之 恋

马丽君

是夜,我听到了雪声。

走近阳台的窗口——是玉屑撒落的声音。仰头,天空成了暖暖的玫瑰色,似乎是为了和逼人的寒气交相辉映。侧耳,沙沙声从房顶、从树梢、从若有若无的风的呼吸里,渐渐弥漫开来。伸手,一粒粒细沙密密匝匝地落入手掌,凉意沿着指尖荡漾到心间。开窗,沁人心脾的感觉轻柔地掠过每一寸肌肤。借着微微的天光,冰晶们一路闪闪烁烁、浩浩荡荡,自九天之外开往人间。

屏息细看,这些冬的精灵,透着荧光,从天幕滑落,不时眨眨鬼魅似的眼睛。他们曾是原野上的水滴,被阳光蒸腾到了空中,奔跑为云,伤心作雨,现在被广寒宫的萧瑟感染,忧郁得凝结成这般模样。

不知从何时开始,他的脚步变得叮叮咚咚,他的身姿变得玲珑坚硬,他成了狰狞的战士,在苍穹下呼啸奔腾。他的心燃着火,脚踩着霜,时而风度翩翩,拔剑起舞;时而怒发冲冠,金戈铁马。他像喝了酒的大侠,醉里挑灯看剑,梦回吹角连营,踉踉跄跄,激情四射,把房檐敲打得铮铮作响,把草木震慑得咔嚓有声,把天地整得一片肃杀之气。鸟无声山林寂寂,夜冗长寒声凄凄,他终于醉卧沙场,傲骨紧裹着的柔情慢慢晕染,缓缓地憔悴。临风落下的,是平台上最晶莹的一滴泪。

夜阑人静,雪还在盖地铺天地飘洒。嫦娥舒展她的寂寞长裙,打开妆台的镜子,替她梳理发髻,空灵的音乐无声地流淌,盛装的精灵们像礼花一样凌空绽放。她明眸灼灼,招招摇摇,轻盈地上下翻飞;她曳步窈窕,巧目流盼,洒落了一地的胭脂水粉。所到之处,碎瓦残墙,疑是歌楼舞榭;枯草断枝,堪称玉树琼花;就连深夜里缥缈的街灯,也像极了金灯华烛、海市蜃楼。真是东风夜放花千树,梦里花开扑簌簌。她不喧哗,不矫饰,在这个属于自己的晚上,一丝不苟地羽化成正待出阁的新娘,从容地出嫁,把自己许给冬天。

黎明,人语渐响,一切已尘埃落定。寒气依旧凛冽,积雪深厚,冰凌悬挂,四顾之下,神清气爽,行人怡然自乐。大雪把车马的嘈杂、城市的浮躁一股脑儿掩埋了,零星地跳跃在大街小巷的嬉戏的少年,点缀出一个又一个可心的雪人。须臾,红日妖娆,昼夜变化,雪沙、雪晶、雪花通通消融成冰河,车碾成泥,践踏为尘,袅袅娜娜地倏忽无痕。

在生命的最后时刻,冰雪在笑,似春蚕缚丝后的化茧为蝶,如蜡炬成灰前的烛光一跃。她们在笑,阳光是腮边的红晕,月色是微露的皓齿;她们在笑,笑得云飞雪落,山川动容;笑得素面朝天,倾国倾城。

以花为貌,以玉为骨,秋水沐浴所以仙袂飘飘,春花映射所以容颜皎皎,雪与冬聚散两依依,意济苍生,情牵天下。

长久地伫足于霁后的清晨,我找见了伏羲的神勇睿智和女娲的圣洁美丽。

(选自散文阅读网2013年5月14日)


同类题4

阅读理解

    Open work spaces definitely have their benefits,but they come with the drawback of offering employees little to no control over visual distractions(干扰).With so many people around and so much going on,some of us can easily get disturbed by this information overload and lose focus in what's really important.That's where the Focus Cap comes into play.

    “As we are still cavemen or mammals kept in an unnatural environment,I believe that only by reclaiming(收回)the normal,stress-free human state through simple tools and techniques can we finally release our actual creative potential and create our meaningful work for a brighter future,”says German designer Hannes Greblin,inventor of the Focus Cap.

    After looking at other products designed at minimizing visual distractions,Greblin decided that most of them were either too expensive or too uncomfortable to become mainstream,so he decided to go with something much simpler —a simple cap with a retractable visor(可伸缩的帽沿).

    Greblin's Focus Cap is really straightforward.You just wear it like a regular cap'with the sides of the visor retracted,and just collapse the sides whenever you need to focus on what's ahead of you.Whether you're trying to focus on a task in an open work office.Trying to study at university,or practicing yoga in a park and trying to ignore stares from strangers,the Focus Cap can help.

    To be honest,this whole project sounds like a joke,but the Focus Cap does have its own website where people interested in this unusual accessory can actually sign up for updates on when it will go on sale.Greblin claims it will cost 30 euros($37)plus shipping.