堤岸防护工程的基础或护根工程多为堆石结构，习惯称为（）或护脚。
A.岩石
B.护坡
C.坦石
D.根石
参考答案：D
— I can't understand the teacher in class. He speaks too fast.
— _____ can help you a lot.[ ]
A．Working with a group
B．Practicing listening
C．Reading the textbook
D．Making flashcards
患者甲状腺摄131I率增高，且高峰前移，提示其疾病为
A．地方性甲状腺肿
B．单纯性甲状腺肿
C．亚急性甲状腺炎
D．Graves病
E．慢性淋巴细胞性甲状腺炎
