When Akiyama Toyohiro, Japan''s first astronaut, completed his stint in space, he came back down to earth with more than one worry.

A．spell

B．sling

C．sting

D．stink

下列哪项属三级预防内容（）

A.产前检查

B.疾病筛检

C.康复治疗

D.遗传咨询

E.横断面调查