After two months’ training，the astronauts are to adapt to the conditions of weightlessness.
A. accustomed
B. ing
C. realized
D. succeeding
网友回答
(答案→)A. accustomed
B. ing
C. realized
D. succeeding
解析：考查固定词组。固定词组be accustomed to…习惯…适应…；句意：两个月的训练以后，宇航员们已经习惯并能适应失重的环境了。故A正确。