地方性甲状腺功能减低症的原因是（）
A.孕妇血液中有抗体
B.孕妇患甲亢
C.孕妇饮食中缺碘
D.孕妇早期病毒感染
E.孕妇服用甲状腺素
参考答案：C
句型转换。
1. Those are my parents. (改为一般疑问句)
_____ _____ _____ parents?
2. They are my aunts. (改为否定句)
_____ _____ my aunts.
3. That's my sister. (对画线部分提问)
_____ is _____ ?
4. This is my mother and this is my father. (改为同义句)
These_____ my _____ .
5. Is that your brother? (作否定回答)
_____ , _____ _____
6. This is my friend. (改为复数形式)
_____ _____ my _____ .
7. Is the girl Mary? (作肯定回答)
_____ , _____ _____ .
8. These are his brothers. (改为否定句)
_____ _____ his brothers.
体位性低血压诊断标准错误的是（）。
A.由卧位向坐位或站立位转移
B.出现面色苍白、恶心、呕吐、胸闷、心慌不适、冷汗等症状
C.甚至意识丧失或晕厥
D.血压下降20～30mmHg
E.血压下降1.33～2.67kPa
