15000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 52)

Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers.

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Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers.

dunes

piles

valleys

stores

Giải thích

A

Sand dunes: những cồn cát