On July 1 day, 2006, the Qinghai-Tibet Railway was officially opened for operation. Look at the map and answer the questions. (1) Tibet's main characteristic tourism resources _ _ _ _ _. (2) Input

(1) The main characteristic tourism resource in Tibet is the original ecological plateau snow scene; Unique Tibetan culture (national customs);

(2) Entering the Qinghai-Tibet Plateau and passing through three cities: A, B and C, where B is located in the Qaidam Basin (write letters) and C is named Lhasa;

(3) There are many lakes in Tibet Plateau, and the air is thin and oxygen-deficient; The climate is cold and the ecological environment is fragile; So: CD.

(4) The construction of the Qinghai-Tibet Railway is conducive to the transformation of Tibet's resource advantages into economic advantages (conducive to Tibet's development and strengthening economic ties between Tibet and the rest of the motherland); It is conducive to poverty alleviation for ethnic minorities and strengthening national unity; It is conducive to consolidating national defense and defending the frontier.

So the answer is: (1) the original scenery of plateau snow area; Unique Tibetan culture (national customs); (2)B； Lhasa; (3)C？ d； (4)① It is beneficial to transform Tibet's resource advantages into economic advantages (it is beneficial to Tibet's development and to strengthen economic ties between Tibet and the rest of the motherland); (2) it is conducive to poverty alleviation of ethnic minorities and strengthening national unity; (3) is conducive to the consolidation of national defense and border defense.