— What do you want _____?
— I want to be a doctor.[ ]
A. to do
B. to be
C. to work
答案:B
No sound and no voice______ for a while.
A.have heard
B.has heard
C.has been heard
D.have been heard
维生素E和维生素C均为抗氧化维生素,为预防动脉粥样硬化,二者联合应用效果更好,其优点是()
A.维生素E可促进花生四烯酸转变为前列腺素
B.维生素C使血管弹性增加
C.维生素B保护血管内壁光滑
D.维生素C可节省维生素E
E.维生素C降胆固醇