题干

下图中①~⑤表示一个细胞有丝分裂过程中染色体变化的不同情况,在整个细胞周期中,染色体变化的顺序应该是  (  )

A:①④⑤③②

B:②③①④⑤

C:①⑤④③②

D:⑤④③②①

上一题 下一题 0.0难度 选择题 更新时间:2011-12-07 12:18:34

答案(点此获取答案解析)

C

同类题2

阅读下面的文章,完成后面问题。
                                                                                                                  爸爸的花儿落了(节选)
        快回家去!快回家去!拿着刚发下来的小学毕业文凭——红丝带子系着的白纸筒,催着自己,我好像怕赶不上什么事情似的,为什么呀?
        进了家门,静悄悄的,四个妹妹和两个弟弟都坐在院子里的小板凳上。他们在玩沙土,旁边的夹竹桃不知什么时候垂下了好几枝子,散散落落的,很不像样,是因为爸爸今年没有收拾它们——修剪、捆扎和施肥。
        石榴树大盆底下也有几粒没有长成的小石榴,我很生气,问妹妹们:
        “是谁把爸爸的石榴摘下来的?我要告诉爸爸去!”
        妹妹们惊奇地睁大了眼,摇摇头说:“是它们自己掉下来的。”
        我捡起小青石榴。缺了一根手指头的厨子老高从外面进来了,他说:
        “大小姐,别说什么告诉你爸爸了,你妈妈刚从医院来了电话,叫你赶快去,你爸爸已经……”
        他为什么不说下去了?我忽然着急起来,大声喊着说:
        “你说什么?老高。”
        “大小姐,到了医院,好好儿劝劝你妈,这里就数你大了!就数你大了!”
        瘦鸡妹妹还在抢燕燕的小玩意儿,弟弟把沙土灌进玻璃瓶里。是的,这里就数我大了,我是小小的大人。我对老高说:
        “老高,我知道是什么事了,我就去医院。”我从来没有过这样的镇定,这样的安静。
        我把小学毕业文凭,放到书桌的抽屉里,再出来,老高已经替我雇好了到医院的车子。走过院子,看那垂落的夹竹桃,我默念着:
        爸爸的花儿落了。
        我已不再是小孩子。

同类题5

语法填空

    Parkour(跑酷)is a sport which trains people to deal with any physical obstacles in their path. It is not a competition but a physical training. A person joining in parkour is called traceur. Traceurs run along a path and use only their bodies to deal with the obstacles in the most efficient way. Parkour pays more attention to efficiency____(make) it different from the similar practice of free running. Parkour____(common) includes running, jumping, climbing, rolling and other similar types of physical movements. Many teenagers think that parkour is quite ____ cool sport. They have great interest in it.

    The ____(invent) of parkour can't ____(give) to one person because many people have worked on it. A French officer developed the earlier form of parkour. The term “parkour” was first introduced by David Belle and Sebastiar Foucan in the early 1980s____ that time, they were two teenagers. This sport ____(become) more popular in the1990s when many films were made on it.

    ____ makes parkour different from other sports is its power to bring people together. It allows traceurs to forget the ____(society) and other problems, and makes a large group work and grow together instead of competing with each other. People can benefit from parkour as it can make them stronger. Still, it also influences one's thought process by improving self-confidence and critical-thinking skills. In this way, parkour allows one to deal with ____(difficulty) in daily life if he or she deals with them through parkour.