Why do climbers on Mount Everest carry bottles of oxygen? A. The weather is not cold. B. Climbing makes them tired. C. The air is very thin. D. They are thirsty.
Giải thích
Lời giải:
Đáp án: C
Thông tin: The air is very thin and cold.
Lời giải:
Đáp án: C
Thông tin: The air is very thin and cold.