Normally, which is true regarding permafrost?
Giải bởi Vietjack
Đáp án đúng là: C
Giải thích:
Dựa vào câu: Another problem facing Alaska is its thawing permafrost. Much of the land in Alaska used to be permanently frozen or frozen for most of the year.
Dịch: Một vấn đề khác mà Alaska phải đối mặt là lớp băng vĩnh cửu đang tan dần. Phần lớn đất đai ở Alaska từng bị đóng băng vĩnh viễn hoặc đóng băng trong phần lớn thời gian trong năm.
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