第四章测试1. The word “Yardang” is a ____________ term. （ ）
A:geographic B:Geochemical C:geological D:geomorphic
答案:D
2. Yardangs are found mainly in arid or extremely arid regions with scarce precipitation, little vegetation and strong ___________. （ ）
A:wind erosion B:wave erosion C:soil erosion D:water erosion 3. Dunhuang yardang landform is mainly composed of ___________ geological relics . （ ）
A:Tertiary B:Quaternary C:Jurassic D:Cretaceous 4. Yardangs are particularly concentrated in _______ in Xinjiang and west of Gansu Province, as well as in the Qaidam Basin in Qinghai Province. （ ）
A:basins B:Hills C:plain D:plateau 5. At the early stage of Himalayan movement about 40 million years ago, the Altun and Qilian Mountains in the south were rapidly _______, while the hilly area in the north were slowly rising, so the faulted Anxi-Dunhuang basin was formed. （ ）
A:uplifting B:sinking C:subsiding D:shifting
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