I am too tired, father. ________ having a rest?[ ]
A. Let's
B. Why
C. Which
D. How about
D
24572600000改写成用“亿”作单位的数是______,保留整数约是______.
遗传病的预防措施不包括
A.产前诊断
B.携带者测试
C.症候前诊断
D.致病基因的定位与鉴定
E.遗传病易感性分析