air becomes ____and ____(越来越薄)as the plane ____(climb)in the sky
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air becomes ____and ____(越来越薄)as the plane ____(climb)in the sky
air becomes ____and ____(越来越薄)as the plane ____(climb)in the sky
air becomes ____and ____(越来越薄)as the plane ____(climb)in the sky
air becomes 【thinner 】and 【thinner 】as the plane 【climbs】in the sky