帕金森病
A.卡马西平B.强的松C.A型毒霉素D.免疫球蛋白E.EACA
参考答案:A
We didn't have enough chairs, _____ some of the students had to sit on the floor. [ ]
A. or
B. as
C. so
D. but
胚乳发育的()方式中,初生胚乳核的第一次分裂将胚囊分隔成两室。
A.核型
B.细胞型
C.沼生目型
D.同时型