关于子宫内膜的再生，下列哪项是正确的()
A．致密层
B．功能层
C．子宫肌层
D．海绵层
E．基底层
参考答案：E
句型转换
1. Sam is in Class One. (改为一般疑问句，并作肯定回答)
—_____ Sam in Class One?
—Yes, he _____ .
2. He is my friend. (改为否定句)
He _____ my friend.
3. Helen and Wang Dong are 12 years old. (改为否定句)
Helen and Wang Dong _____ 12 years old.
4. They are English. (改为一般疑问句，并作否定回答)
—_____ they English?
—No, they _____ .
5. Helen is from America. (对划线部分提问)
_____ Helen from?
