—The doctor told me _______ too much but I find it difficult.

—The doctor is right. The less you drink, _______ you will be. [ ]

A. don't drink; the healthier

B. not to drink; the healthier

C. not to drink; the more healthier

D. don't drink; healthier

根据其安全性及可靠性，目前常用的产前染色体核型分析的诊断方法是

A．绒毛活检术
B．羊膜腔穿刺术
C．经皮脐血穿刺术
D．胎儿镜检查
E．胚胎植入前诊断