Paragraph 4 of the passage serves mainly to do which of the following? A. Show the progress of desertification down through history. B. Propose a method for dealing with the desertification

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Paragraph 4 of the passage serves mainly to do which of the following?

Show the progress of desertification down through history.

Propose a method for dealing with the desertification problem.

Describe one progress that leads to desertification.

Giải thích

Đáp án C

Describe one progress that leads to desertification.

Thông tin nằm ở đoạn 4: “Salination is a type of land degradation that involves an increase in the salt content of the soil.”