题干

“SARS”病毒的遗传物质中含有核苷酸、碱基、五碳糖的种类分别是   (    )

A:1、4、2

B:4、5、1

C:4、4、1

D:8、4、1

上一题 下一题 0.0难度 选择题 更新时间:2016-11-25 06:00:34

答案(点此获取答案解析)

C

同类题2

根据短文理解,完成下列各题。

      Before the spring Festival, which is the most important festival in China, millions of passengers are struggling to make the once-a-year trip home. Because of a power failure caused by snow, more than 136 trains were forced to stay in Hunan Province. Almost 150,000 passengers were stopped from going back their homes. It's reported that the losses will be 111.1 billion yuan.  

In central China's Hunan Province, one of the worst hit area, seven people have died and snow is affecting(影响) the lives of 25.22 million people in 14 cities and 112 counties across the province. Though the power supply resumed(恢复) at 4:00 p.m. Saturday, 50 trains remain stranded (滞留) between Hengyang City in Hunan and Guangzhou provinces. And in Guangzhou, an official with Guangzhou railway authorities said the number of stranded passengers in Guangzhou City alone could hit 600,000 on Monday if the situation continued.

How to solve the problems as soon as possible? In order to help the passengers meet their families and solve the traffic problems, our government do what they can. First, The Ministry of Railways Ordered 63 trains to go to Guangzhou via (通过) the Beijing-Kowloon Railway Line or Shanghai-Kunming Railway Line instead of the Beijing-Guangzhou Railway Line. Second, the ministry also organized 35 trains from Beijing, Wuhan and Nanchang cities to help transport the stranded passengers. The thirdly, Guangdong authorities sent 15 million text messages (短信)warning drivers not to take highways leading north. Some Guangzhou citizens try their best to help the stranded passengers, such as offering medicine, raising money and cooking free meals for the stranded students.

      The snow disaster(雪灾) is so terrible, but all of the Chinese and government is trying their best to succeed in beating it.

同类题5

阅读下面的文字,完成后面小题。

父亲和那道坡

宋向阳

    秋生的家在柳河村最北头的山根下,绕过一道胳膊肘子弯儿的土坡,才能过去。

    秋生开着新买的轿车回家,道窄,只好停在十米外的巷口。他怕车子被刮蹭,一个劲朝那边望。“你对车倒挺上心啊。”父亲徐老套在饭桌上叨咕着,还用稀奇古怪的目光扫他。秋生低声地解释道:“我三年的工资都花在车上了,那道坡忒堵。”

    秋生两口子一走就是两个多月,隔三差五往回打个电话。一次,隔壁的小东把一包羊肉送到了他家。小东说:“叔啊,看看你儿子多孝顺啊。”徐老套的脸上像结了霜,瞅都不瞅一眼。

    小东走后,媳妇问老套:“你绷着脸给谁看呢?不识抬举。”

    徐老套愤愤地说:“他徐秋生是在救济困难户吗?连个面都不照,好大的架子啊。”

    媳妇叹了口气,说:“谁让你找个猫不拉屎的地方盖房,拐弯抹角连个车都不得放。”

    徐老套大步来到院外,望着那道十多米长、五米多高的土坡,使劲哼了一声。他蹲在那儿,点着一根旱烟,猛地吸了几口,脸蛋憋得像下蛋的母鸡。

    徐老套去集上买了几把镐锹,还叫人焊了一个铁斗子的推车。除了下地,他把很多时间都用在了修路上。

    日头还没升起,徐老套就站在了土坡下,挥着大镐刨。土质很硬,他一镐下去,便击出一颗颗金星来。徐老套拿出了年轻时开大山的劲头,抡圆膀子干着。汗水很快浸透衣服,紧紧贴在了他的身上。媳妇看着心疼,帮他往车子里装土。

    徐老套一把夺过铁锹说:“去,这事儿不用你管。”

    媳妇说:“你悠着点,别累坏了。”

    徐老套嘴里应着,却不歇手。媳妇给他沏了一壶浓茶,端了出来。徐老套嗓眼里发干,放下家什坐在了凳子上。他喝着茶,眼前浮现出儿子小时候在土坡前和他捉迷藏的影子,心里不禁七上八下。

    胳膊肘弯儿的土坡一天天变小着,徐老套手上的老茧一天天变厚着。累的时候,他都会朝远处望一会儿。他想看到那个熟悉的身影,可是却一次次失望。媳妇劝他找几个帮工,他却说啥也不答应。

    这天,徐老套正在门口忙着。村书记大成走了过来,喊道:“老套哥,你儿子给你捎钱来了。”徐老套没有抬头,仍然在干活。大成说:“都啥年头了,你还想当愚公啊。”徐老套这才停手,冲他干笑一下。大成把钱递了过来,说:“上午我在城里遇到秋生,他让我给你们。”徐老套一把拨开大成的胳膊,说:“这钱我不要,你退给他吧。”

    “亲儿子的钱,不要白不要。”大成说。

    徐老套哼了一声,说:“徐秋生凭啥不自己回来?他不认识柳河村的路吗?”

    大成说:“可能,他有点忙吧?”

    徐老套说:“一个小科长比县长还忙吗?”

    媳妇见他九头牛拉不回来的样子,便从大成手里接过了钱。徐老套瞪了她一眼,说:“这钱你自己花吧,我一分不沾。”媳妇用手点了点他,回屋里给大成去找烟卷。

    “我让你堵!我让你堵!”徐老套举起大镐,用力地朝土坡刨了下去。

    三个月后,秋生两口子还没有回来。一天,他突然接到家里的电话。母亲在那头颤巍巍地说:“儿啊,你快回来,你爹病得可不轻啊。”没等秋生说话,母亲就嗖地放下电话,任凭秋生怎么回拨,都没人接。秋生吓出一身冷汗,带着媳妇急急忙忙撵了回来。他的眼里冒着火,把车开到家门口没等停稳,就跑进屋去。可是,父亲却满面红光地坐在炕头,没有一丝病意。他疑惑地瞅着母亲说:“妈……”

    徐老套笑眯眯地说:“儿子,你的车放哪儿了?”

    秋生眨巴眨巴眼睛,说:“就放门口了。”

    徐老套拽住儿子的手说:“那道坡还有吗?”

    秋生的呼吸顿时急促起来,泪水在眼里打起了转转。