十五络脉是指十四经络脉加（）
A.胃之络
B.脾之络
C.胃之大络
D.脾之大络
E.虚里之脉
参考答案：D
John couldn’t finish his words ______ something had struck his throat.
A．though
B．as though
C．when
D．since
甲状腺素中含有
A．铁B．硒C．钙D．碘E．氯
