It was ______________news that we all excited at it. [ ]

A. such an exciting  

B. so exciting a      

C. such exciting    

D. so an exciting

血液在体循环和肺循环中流动的共同规律是（）

A.心室→动脉→毛细血管→静脉→心房

B.心室→静脉→毛细血管→动脉→心房

C.心房→动脉→毛细血管→静脉→心室外

D.心房→静脉→毛细血管→动脉→心房