单项选择题

______ is causing soil erosion(侵蚀)in the game reserves.

A．The bad weather
B．The disappearance of vegetation which is eaten by the animals
C．The violent' storms
D．The animals
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单项选择题
As far as we can tell from the passage, why does the Government bother to maintain game re serves
A．To prevent the people from using the land.
B．To reserve the land for building development.
C．To obtain income from tourism.
D．To stop tourists from making a nuisance(令人讨厌)of themselves.
单项选择题
The word this refers to ______ in the last sentence of the passage.
A．the income obtained from tourists who park their cars in the town
B．the revenue derived from tourists who visit the game reserves
C．the problem concerning game reserves in East Africa
D．the claim put forward concerning the duty of the Government
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