【单选题】近年来基因工程的发展非常迅猛,科学家可以用 DNA 探针和外源基因导入的方法进行遗传病的诊断和治疗,下列做法不正确的是 ( ) A . 用 DNA 探针检测镰刀型细胞贫血症 B . 用 DNA 探针检测病毒性肝炎 C . 用导入外源基因的方法治疗镰刀形细胞贫血症 D . 用基因替换的方法治疗 21 三体综合征
【简答题】She has got this fear of losing control so she never shows her emotions. (obsess) 2. People under a lot of stress at work will often experience , irritability and a loss of confidence. (mood) 3. They ...