题干

目前治疗癌症的方法有化疗和放疗,其中化疗的原理是(    )

A:直接作用癌细胞表面杀死癌细胞

B:抑制纺锤体的形成抑制癌细胞增殖

C:抑制DNA的复制抑制癌细胞增殖

D:化学药物作用于中心体抑制细胞分裂

上一题 下一题 0.0难度 选择题 更新时间:2010-05-26 10:43:30

答案(点此获取答案解析)

C

同类题3

阅读短文,回答问题。

    孩子,你太幸福了,天待你太厚了。我更高兴的更安慰的是:多少过分的谀词与夸奖,都没有使你丧失自知之明,众人的掌声、拥抱,名流的赞美,都没有减少你对艺术的谦卑!总算我的教育没有白费,你二十年的折磨没有白受!你能坚强(不为胜利冲昏了头脑是坚强的最好的证据),只要你能坚强,我就一辈子放了心!成就的大小、高低,是不在我们掌握之内的,一半靠人力,一半靠天赋,但只要坚强,就不怕失败,不怕挫折,不怕打击——不管是人事上的,生活上的,技术上的,学习上的——打击;从此以后你可以孤军奋斗了。何况事实上有多少良师益友在周围帮助你,扶掖你。还加上古今的名著,时时刻刻给你精神上的养料!孩子,从今以后,你永远不会孤独的了,即使孤独也不怕的了!

    赤子之心这句话,我也一直记住的。赤子便是不知道孤独的。赤子孤独了,会创造一个世界,创造许多心灵的朋友!永远保持赤子之心,到老也不会落伍,永远能够与普天下的赤子之心相接相契相抱!你那位朋友说得不错,艺术表现的动人,一定是从心灵的纯洁来的!不是纯洁到像明镜一般,怎能体会到前人的心灵?怎能打动听众的心灵?

    音乐院长说你的演奏像流水、像河,更令我想到克利斯朵夫的象征。天舅舅说你小时候常以克利斯朵夫自命,而你的个性居然和罗曼·罗兰的理想有些相像了。河,莱茵,江声浩荡……钟声复起,天已黎明……中国正到了“复旦”的黎明时期,但愿你做中国的——新中国的——钟声,响遍世界,响遍每个人的心!滔滔不竭的流水,流到每个人的心坎里去,把大家都带着,跟你一块到无边无岸的音响的海洋中去吧!名闻世界的扬子江与黄河,比莱茵河的气势还要大呢……黄河之水天上来,奔流到海不复回……无边落木萧萧下,不尽长江滚滚来……有这种诗人灵魂的传统的民族,应该有气吞斗牛的表现才对。

    你说常在矛盾与快乐之中,但我相信艺术家没有矛盾不会进步,不会演变,不会深入。有矛盾正是生机蓬勃的明证。眼前你感到的还不过是技巧与理想的矛盾,将来你还有反复不已更大的矛盾呢:形式与内容的枘凿,自己内心的许许多多不可预料的矛盾,都在前途等着你。别担心,解决一个矛盾,便是前进一步!矛盾是解决不完的,所以艺术没有止境,没有Perfect〔完美,十全十美〕的一天,人生也没有perfect〔完美,十全十美〕的一天!唯其如此,才需要我们日以继夜,终生的追求、苦练;要不然大家做了羲皇上人,垂手而天下治,做人也太腻了!

同类题5

阅读理解

    Sandra Bullock turned 51 last month. But because she looks exactly the same as she did in Miss Congeniality, a movie filmed back in the 20th century, everyone calls her “ageless.” Bullock is just one of a number of stars in their 40s and 50s who've had birthdays recently but have not gotten older, unlike the rest of us in their age group. Take Halle Berry. One website put a photo of her 20 years ago next to one of the newly 49-year-old Berry and dared us to choose which was which. “This Is What 49 Looks Like,” it said. Seriously, if that's what 49 looks like, I must be 71.

    However, even a generation ago, famous faces evolved. Look at a picture of Grace Kelly at age 52 in the early 1980s. She looks like a beautiful middle-aged woman. Today she'd look old for her age.

    The goal now is to prevent aging while you are still young, using all the magical nonsurgical options medicine has to offer. Eventually these techniques will become less expensive, and ordinary people my daughter's age will have them. Already anti-aging is starting to be considered maintenance, like coloring your hair. My friends and I find ourselves openly debating techniques that we used to make fun of. Does fat-freezing work? How much time do you have to spend in the gym to keep the body of a 35-year-old after 50? It's all so exhausting. But members of the next generation have it tougher. They'll have to ask themselves whether they want to spend their youth trying not to get old. I've already seen “Sexy at 70” headlines. Will everyone be expected to go to their graves(坟墓) looking hot?

    I also have to wonder what else we are slowing along with age. How do you move on if you're working so hard to stay the same? And besides, if you've known the ache of watching a daughter pack up for college, you know you can't stop the clock.