软骨发育不全为常染色体显性遗传病,基因型为HH 的个体早期死亡。一对夫妻均为该病患者,希望通过胚胎工程技术辅助生育一个健康的孩子。下列做法正确的是( )
A:经超数排卵处理后进行体外受精
B:从桑椹胚中分离少量滋养层细胞,培养后检测基因型
C:从羊水中提取细胞进行检测,并根据检测结果淘汰基因型为hh 的胚胎
D:将一个囊胚进行多等分,从中筛选所需胚胎,培养至原肠胚期后移植到子宫
一位同学用成语给自己“画像”:突出的优点——知过必改;明显的缺点——粗枝大叶;待人接物——与人为善;理想——品学兼优。
请你也用成语给自己“画像”,让大家对你有一个初步的印象。(请任选三项作答,不得照搬上面那位同学使用过的成语)
突出的优点:____;明显的缺点:____
待人接物:____;理想:____
根据短文内容及首字母提示,填写所缺单词,使短文意思完整,每空只填一词。 Millions of American children attend summer camp. Traditional American summer camps offer young people a c____ to play many sports. These camps may be in the mountains. Or they may be in the woods, or at a lake. O____ camps teach activities like painting or music. Or t____ teach computer programming or foreign languages. Children at all kinds of camps m____ new friends. They learn new skills and develop independence (独立). Some children go to camp d____ the day and return home at night. These places are c____ day camps. Children as y____ as four years old attend day camps. Others stay at camp all day and all night. Most children w____ attend overnight camp are between the ages of about six and sixteen. Children s____ at an overnight camp for between one and eight weeks. P____ can pay less than one-hundred dollars a week for an overnight camp. Or they can pay more than seven-hundred dollars a week.