外研版高中英语,必修3,module4课件
Finish the the exercise at Activity 4, Page33.1. prevent you (from) seeing the sun / strong enough to move sand dunes. 2. he experienced a terrible sandstorm. 3. because of desertification. 4. cause deserts and sand-storms to increase. 5. the thick dust makes it difficult to see / the drivers cannot see clearly. 6. prevent the desert coming nearer.
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