答案:D
每个子女都含有父母双亲的遗传物质,母亲的遗传物质是通过下列哪种细胞传递给子女的[ ]
A.脐带
B.卵细胞
C.受精卵
D.子宫内膜
I can't give my son the leading position.________, he is too young;secondly, I want Mr Smith to
have the job. [ ]
A. After all
B. For example
C. In the end
D. To begin with