She felt completely ______ during the vacation but now she has to go back to work again.

A．in anger

B．at once

C．in general

D．at ease

抗球蛋白试验原理主要是（）。

A.抗体搭桥作用

B.中和红细胞表面负电荷

C.中和红细胞表面正电荷

D.消化红细胞表面唾液酸

E.缩短红细胞距离