Tourism, _______ it brings in money to a country, can also result in damage to the World 
Heritage sites there.         
A．once B．whileC．ifD．a(chǎn)s
B

試題分析：A. once一旦，B. while雖然，當(dāng)…時候，然而，C. if如果，D. as正如，句意：--旅游業(yè)雖然給一個國家?guī)硎找妫矔o這里的世界遺產(chǎn)帶來破壞。所以選B。
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