WHERE DO CLIMBERS PUT THEIR EMPTY OXYGEN BOTTLES

2. - DE THI OLYMPIC MON TIENG ANH LOP 6 TRUONG CHUYEN HA NOI AMSTERDAM NAM 2011
Lớp 6 Tiếng Anh DE THI OLYMPIC MON TIENG ANH LOP 6 TRUONG CHUYEN HA NOI AMSTERDAM NAM 2011
2. Where do climbers put their empty oxygen bottles?A. On the ground B. In trash cansC. On their back D. In their tents