填空题

Questions 16-20
Complete the following statements using NO MORE THAN TWO WORDS AND/OR A NUMBER for each gap.

填空题 Pressurised space suits make astronauts feel like a 1.

填空题 The 1 are big and awkward to work with.

填空题 While on a space walk, there is a danger of being hit by 1.

填空题 1 are too bright to look at with the naked eye.

填空题 An orbit of the Earth takes 1.