题干

所谓的“设计试管婴儿”比一般所说的试管婴儿要多一个步骤,是哪一步(   )

A:体外受精

B:胚胎移植

C:基因检测

D:细胞核移植

上一题 下一题 0.0难度 选择题 更新时间:2010-11-10 03:05:33

答案(点此获取答案解析)

C

同类题1

阅读下面古诗,完成后面小题。
                                                                                  西湖晚归回望孤山寺赠诸客
                                                                                                白居易
                                                                          柳湖松岛莲花寺,晚动归桡出道场。
                                                                          卢橘子低山雨重,栟榈叶战水风凉。
                                                                          烟波淡荡摇空碧, 楼殿参差倚夕阳。
                                                                          到岸请君回首望, 蓬莱宫在海中央。
     【注释】①柳湖:西湖旁多植柳,故而称柳湖。莲花寺:孤山寺。②桡(ráo):小船。③卢橘:枇杷。④栟榈(bīng lǘ):棕榈⑤战:颤动。⑥蓬莱宫:传说海上有仙山,名蓬莱,而孤山寺中又有蓬莱阁,语带双关。

同类题4

   Why play games? Because they are fun, and we can learn even more while playing. Following the rules, planning your next move, acting as a team member — these are all "game" ideas that you will come across all through your life. They can help you in different ways.
   Think about some of the games you played as a young child, such as rope-jumping and hide-and-seek. Such games are very interesting. But perhaps more importantly, they translate part of life into exciting games that teach children some of the basic rules they will be expected to follow the rest of their lives, such as taking turns and cooperating (合作).   
   Many children's games have a practical side. Children around the world play games that prepare them for work they will do as grown-ups. For example, some Saudi Arabian children play a game called bones, which improves the hand-eye coordination (协调) needed in fishing.
   The most famous games of all, the Olympic Games, bring athletes from around the world together to take part in friendly competitions. People who watch the event (比赛项目) know that a gold medal is a win for the whole country, not just the athlete who got it. For countries experiencing natural disasters (灾害) or wars, an Olympic win can mean so much.
   Sports games are also an event that unites (团结) people. Football is the most popular sport in the world. People all over the world play it — some for fun and some for a living. Nicolette Iribarne, a Californian football player, has discovered a way to spread hope through football. He created a foundation (基金会) to provide poor children with not only soccer balls but also a bright future.
   Next time you play your favorite game or sport, think about why you enjoy it, what skills are needed, and whether these skills will help you in other parts of your life.