다음을 읽고 물음에 답하시오.
ⓐ___________________. For example, they grow about 1 and 1/2 inches taller. Their hearts get smaller because the blood in their bodies moves up to their heads. Also, their bones and muscles become ⓑ______. To keep their bones and muscles ⓒ________, astronauts must exercise 90 minutes every day.
1. 윗 글의 주제문으로 ⓐ의 위치에 오기에 적당한 것은?1)
① Astronauts brains change in space
② Astronauts bodies change in space.
③ Astronauts have to solve some problems in space.
④ Astronauts must make healthy in many ways in space.
⑤ Part of staying healthy is exercising. | 
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1:1문의
