____ abroad for two years, the two astronauts went back home last year.

A．Educating

B．Educated

C．Having been educated

D．being educated

哪些运动适合老年人（）

A.拔河类集体活动

B.有氧运动

C.无氧运动

D.举重类竞技运动

E.游泳、散步等安全活动