__ __ many Chinese women have received higher education, there are still obstacles that prevent them from enjoying the same opportunities for education and employment as men．          

  给加线字注音

踌躇____ 陛下____  嗫嚅____。

基因型AaBb，经过减数分裂产生4种配子，有AB、Ab、aB、ab．其中AB和ab两种配子各占42%，这两种等位基因与染色体的关系是____ 与____ 　连锁．

随着对外开放步伐进一步加大，我国必须把“引进来”和“走出去”作为自己发展的根本基点。（   ）

如图，⊙O中，AB是直径，半径CO⊥AB，D是CO的中点，DE∥AB，求证：$\stackrel{\wedge }{EC}$=2$\stackrel{\wedge }{EA}$．