The most difficult task is to protect the dam against ________ and earthquake. A. fire B. water C. sunlight D. weather
Giải thích
Đáp án B
Cái gì dự định sẽ được xây dựng trước?
Dẫn chứng trong bài đọc: “The initial stage requires the building of a circular dam eighteen miles in diameter attached to the sea bed in a relatively shallow place in international waters.”