43. What can be inferred from the passage?
(A) The innovation of new spacesuits has made the long mission into the deep space possible.
(B) The astronauts should be as static as possible in space to avoid the gradual waste of muscles.
(C) Without gravity, the vertebrae will naturally expand slightly, causing a person to become taller.
(D) Travel outside of Earth’s protective magnetic shield is irrelevant to the risk of heart disease deaths among the astronauts.