Gap Fill - Factor X - Level 0

HOW TO PLAY:

  • Choose the correct word from the drop-down menus below.
  • Click the button at the bottom to check your answers.
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  • After this paragraph, go to Paragraph 2.

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Paragraph 1

There could be many diseases in permafrost. Permafrost is in and near the North and South Poles. Climate is melting it. This could release , harmful . Scientists are calling 'Factor X'. An diseases said we know about Factor X.

Now go to   Paragraph 2.

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