Creat as Newton was, many of his ideas        today and are being modified by the work of scientists of

our time.    [ ]

A.   have challenged        

B.   have been challenged    

C．have questioned      

D.   have been questioning

关于低血糖的正确说法是（）

A.低血糖患者不会出现头痛、焦虑、精神不安以致精神错乱的表现

B.血糖水平≥3.5mmol/L

C.低血糖患者会感到饥饿、心慌，并出现出汗、面色苍白和颤抖等症状

D.预防和纠正低血糖最重要的是促进胰高血糖素分泌

E.产生低血糖症状和脑功能紊乱的阈值与调节血糖激素分泌的血糖阈值相同