Đáp án B
- Method + of..cách thức, phương pháp
“We use modern methods of teaching and learning” (Chúng tôi sử dụng phương pháp dạy và học hiện đại)
Scientists are unsure of the reason for this (27) ¬________ on the global scale either.
Archaeological evidence also indicates that ball games were common among ancient peoples as (27) _____as the Chinese and the Aztecs.
In time of (27) __________ transportation can rush aid to persons in areas stricken by floods, families and earthquakes.