mindfree ,. leeon, thank you for your response.
I will list the follwing reason
evidence: 1Maintaining this environment is very costly
2.even old oil paint is unaffected by wide fluctuations in temperature and humidity
conclusion:museums could relax their standards and save money without endangering their Renaissance oil paintings
i negate B, that is Under the current standards that museums use when storing Renaissance oil paintings, those paintings do deteriorate at all.
from the above sentence , those paintings are endangered , of course.
so i think b is also assumption. and the conslusion is unhold.
of course, D is also assumption.
I was totally confused , even if i use negation to rest in b and d. and both seem ok.
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