—_________T-shirt do you like better, the red one or the blue one?

—I prefer the red one.

A．How much

B．How many

C．Whose

D．Which

主要解决带有严重遗传性疾病基因的夫妇的优生问题（）

A.人工授精

B.体外受精与胚胎移植

C.卵母细胞质内单精子注射

D.配子移植技术

E.胚胎植入前遗传学诊断