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。The Taj Mahal, in Agra, India, 【小题1】(regard) as one of the most beautiful buildings in the world. The cultural relic 【小题2】(date) back to nearly 400 years ago was built by a ruler named Shah Jahan for 【小题3】(he) beloved wife, Mumtaz Mahal. It took nearly twenty years to complete the building. It is 【小题4】 (impress) that depending on the season and the time of day, the white monument (纪念碑) takes on different colors. But over the years, the Taj Mahal has been changing color even more and not in a good way because it 【小题5】(destroy) by heavy air pollution from nearby factories and cars gradually.
In the 1990s, India’s Supreme Court ordered 【小题6】 number of factories near the monument to close. Also, car and bus traffic is limited.
Now and then, workers use a mud paste (泥巴膜) to remove dirt 【小题7】 the surface of the Tai Mahal. 【小题8】cleaning the monument is expensive and time-consuming (耗时的). And it doesn’t prevent the discoloration.
More action needs to be taken 【小题9】(preserve) the Taj Mahal. “We are trying, but we need to try harder,” said an expert 【小题10】 worked on a 2014 study of the Tai Mahal.