Li Na returned to Wuhan after the Games,________, as is known to us, she had been brought up and

trained to be a gold medalist of tennis.[ ]

A. when  

B. that  

C. there  

D. where

28岁，已婚女性，因多次自然流产，且其姨表妹患21-三体综合征，为避免她子代又患此病，来遗传病门诊咨询，下列预防措施中哪项应除外（）

A.夫妇双方应进行染色体检查

B.妊娠期进行羊水细胞培养及染色体检查

C.妊娠前后应避免接受X线照射

D.妊娠期羊水细胞培养，并作酶及生化测定

E.妊娠期应注意预防肝炎等病毒感染