胆道蛔虫病的典型临床表现是（）
A.中上腹"钻顶样"剧烈绞痛
B.突然发病，突然缓解
C.可有蛔虫吐出史
D.可伴轻度黄疸
E.以上都是
参考答案：E
Look and answer. (看图，仿照例子回答问题)
例: — Is he sad? — No, he isn't. He's happy.
1. — Is he happy? — _______________________________
2. — How do they feel? — ________________________________
试述布鲁纳对发现教学的教学设计提出的四项原则。
— Is he sad? — No, he isn't. He's happy.
— Is he happy? — _______________________________
— How do they feel? — ________________________________