简述单基因病的分类。
参考答案:
①常染色体遗传病:常染色体显性遗传和常染色体隐性遗传;
②X伴性遗传:X伴性显性遗传、X连锁隐性遗传;
③Y连锁遗传:限于男性。
He believes that she is right, _______?
A.doesn’t he
B.does he
C.is she
D.isn’t she
有氧训练最好长期坚持,基本疗程为()
A.2~6周
B.3~7周
C.4~8周
D.5~9周
E.6~10周