Gerneally speaking, it is difficult to breathe at a high       of Tibet (西藏).

Gerneally speaking, it is difficult to breathe at a high       of Tibet (西藏)

1. A.
   altitude
2. B.
   attitude
3. C.
   length
4. D.
   width

Gerneally speaking, it is difficult to breathe at a high       of Tibet (西藏).

A. altitude       B. attitude        C. length          D. width

Gerneally speaking, it is difficult to breathe at a high       of Tibet (西藏).