When storing Renaissance oil paintings, museums conform to standards that call for
careful control of the surrounding temperature and humidity, with variations confined
within narrow margins. Maintaining this environment is very costly, and recent research
shows that even old oil paint is unaffected by wide fluctuations in temperature and
humidity. Therefore, museums could relax their standards and save money without
endangering their Renaissance oil paintings.
Which of the following is an assumption on which the argument depends?
A. Renaissance paintings were created in conditions involving far greater
fluctuations in temperature and humidity than those permitted by current
standards.
B. Under the current standards that museums use when storing Renaissance oil
paintings, those paintings do not deteriorate at all.
C. Museum collections typically do not contain items that are more likely to be
vulnerable to fluctuations in temperature and humidity than Renaissance oil
paintings.
D. None of the materials in Renaissance oil paintings other than the paint are
vulnerable enough to relatively wide fluctuations in temperature and humidity to
cause damage to the paintings.
E. Most Renaissance oil paintings are stored in museums located in regions near the
regions where the paintings were created.
答案D是什么意思？看不懂啊，有谁可以帮忙解释一下，谢谢 | 
