蚯蚓头
参考答案：
防风根头部具明显密集的环纹，称为"蚯蚓头"。
56. He said under his breath that he would keep the secret. The underlined part means _____.
A．loudly
B．shyly
C．politely
D．in a low voice
哪一项不属血虚证表现（）。
A.两颧潮红
B.头晕目花
C.心悸失眠
D.手足麻木
E.面色淡白
