In the Egyptian calendar, the first practical calendar created, the advent of Sirius in the morning sky before sunrise marked the beginning of the annual flooding of the Nile.
Giải thích: practical (a): thực dụng; thiết thực
functional (a): thiết dụng inefficient (a): không có hiệu quả cao
accurate (a): chính xác, đúng đắn standard (a): tiêu chuẩn; chuẩn mực
=> practical >< inefficient
Tạm dịch: Trong lịch Ai Cập, lịch thực dụng đầu tiên được tạo ra, sự ra đời của Sirius trên bầu trời buổi sáng trước khi mặt trời mọc đánh dấu sự khởi đầu của lũ lụt hàng năm của sông Nile.
Đáp án: B
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