下列哪些是原型化方法的优点 Ⅰ．提供了验证用户需求的环境 Ⅱ．接受需求的不确定性

根据句意及首字母提示完成句子。

1. Tina is such a clever student that she always comes at the t________ of her class.

2. Mother added some s________ to the soup, but it wasn't still salty enough.

3. You should c________ your answers .before you hand in your papers.

4. Ducks can swim while c________ can't.

5. You need different kinds of  i________ to make a delicious Beijing Duck.

（）是造成两性畸形的原因。

A、体内荷尔蒙分泌异常

B、胚胎发育期间分化异常

C、性器官发育迟缓

D、心里性别认同障碍

比较大叶性肺炎和小叶性肺炎的病因、发病、病变、转归等方面的异同。

某学校班级中出现一名猩红热患儿，为保护班内其他易感人群，应当对其进行医学观察( )。

A．14天
B．10天
C．7天
D．5天
E．3天

转化