44. According to the passage, which of the following statements is incorrect?
(A) The long-term exposure to low-gravity environment might have adverse effects on the body.
(B) There has been dramatic breakthrough in technologies that operate in space travel since 1969.
(C) A spacesuit is a specially designed garment to keep human alive by keeping a body in a liquid state.
(D) After spending months or years in space during long-term space missions, return to Earth can be challenging to astronauts.