正常情况下，体表面积为1．73 m。的成年人，其肾小球滤过率为

A．100 ml／rain

B．125 ml／min

C．200 ml／min

D．250 ml／min

E．500 m|／min

Once out of the earth’s gravity, the astronaut is        by the problem of weightlessness.

A．affected

B．effected

C．related

D．offered