39.
(A) able
(B) unable
(C) ability
(D) enabling

35. (A) Since (B) Given (C) Namely (D) Therefore

36. (A) launch (B) content (C) impact (D) revolution

37. (A) more than (B) less than (C) at most (D) no more than

38. (A) both… and… (B) either… or… (C) neither… nor… (D) not… but…

40. (A) take (B) takes (C) taken (D) taking

41. Osteoporosis refers to the ____________. (A) bone loss (B) slow growth (C) weight problem (D) blood pressure

42. In the sixth paragraph, “Our muscles and bones have developed to expect this force and it is needed to keep them strong and healthy.” What does the word it refer to? (A) Earth. (B) Gravity. (C) A spacesuit. (D) A spaceship.

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.

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.

45. What is the most appropriate title to the passage? (A) What is an astronaut’s daily life like? (B) Why to develop future space missions? (C) What makes space travels so dangerous? (D) What do we learn from history of space travel?