• In the white boxes below, type the words you hear. You will hear each word twice.
       (Remember to use the correct spelling and capital letters, etc.).
  • Click the button at the bottom to check your answers.
  • Press the "refresh" button on your browser to play again.

1. on the purity of the air
2. a over the Southern Ocean
3. by human activity
4. the in the lower clouds
5. derived from human activity
6. scientists called this pollution-free area, "truly "
7. The scientists analysed the
8. airborne
9. free from
10. from other
11. The researchers that
12. affected by anthropogenic activities

Back to the clean air lesson.

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