IELTS Listening Practice Test
Creating artificial gills
Background
  • Taking in oxygen: mammals - lungs; fish - gills

  • Long-held dreams - humans swimming underwater without oxygen tanks

  • Oxygen tanks considered too

    1
    heavy
     and large

  • Attempts to extract oxygen directly from water

  • 1960s - prediction that humans would have gills added by

    2
    surgery
    

  • Ideas for artificial gills were inspired by research on

    • fish gills

    • fish swim bladders

    • animals without gills - especially bubbles used by

      3
      beetles
      

Building a simple artificial gill
  • Make a watertight box of a materiaI which lets

    4
    gas
     pass through

  • Fill with air and submerge in water Important that the diver and the water keep

    5
    moving
    

  • The gill has to have a large

    6
    surface area
    

  • Designers often use a network of small

    7
    tubes
     on their gill

  • Main limitation - problems caused by increased

    8
    pressure
      in deeper water

Other applications
  • Supplying oxygen for use on

    9
    a submarine / submarines
    

  • Powering

    10
    fuel
      cells for driving machinery underwater

ĐÁP ÁN & GIẢI THÍCH CÂU 1

Giải thích chi tiết

smiley37 Mình cần nghe xem Oxygen tank quá large và gì (Oxygen tanks considered too .... and large)

=> Biết đáp án sắp tới khi nghe "breathing without the help of oxygen tanks" smiley33 Nghe thấy "it's generally agreed that tanks are too heavy and big"

=> Bình oxy thường quá nặng và to (big = large) => Đáp án: heavy check

Lưu ý
  • Nội dung giải thích được viết bởi DOL IELTS Đình Lực - Học Viện Tiếng Anh Tư Duy đầu tiên tại Việt Nam
  • Đề được viết bởi nhà xuất bản lớn gồm Cambridge và Oxford