11. Which of the following is tropical grassland?

A. Taiga
B. Savannah
C. Pampas
D. Prairies

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12. With the disintegration of USSR in end 1991, comprised of ____ Union Republics.

A. 15
B. 10
C. 5
D. 25

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13. The iron and steel industries of which of the following countries are almost fully dependent on imported raw materials?

A. Britain
B. Japan
C. Poland
D. Germany

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14. The temperature increases rapidly after

A. ionosphere
B. exosphere
C. stratosphere
D. troposphere

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15. The humidity of the air depends upon

A. temperature
B. location
C. weather
D. All of the above

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