A At others the painted surfaces inside temples are lifting and flaking off (剥落) and the stone is being eaten away.
B That is enough to have caused some of the ancient carvings to become seriously damaged already.
C These measures would reduce the pollution, but would not stop it completely.
D The government was therefore able to borrow huge sums of money from banks around the world, thinking they would have no problem repaying their debts.
E The problem, however, is not just a European one.
F However, the Mexican government does not have enough money to do the work, and needs to spend what money it has on the Mexican people.
46. E 47. A 48. B 49. F 50. D
