30. GWD25-Q30.

Museums that house Renaissance oil paintings typically store them in envbironments that

are carefully kept within narrow margins of temperature and humidity to inhibit any deteri-

oration. Laboratory tests have shown that the kind of oil paint used in these paintings

actually adjusts to climatic changes quite well. If, as some museum directors believe,

paint is the most sensitive substance in these works, then by relaxing the stan-

dards for temperature and humidity control, museums can reduce energy costs

without risking damage to these paintings. Museums would be rash to relax those

standards, however, since results of preliminary tests indicate that gesso, a compound

routinely used by Renaissance artists to help paint adhere to the canvas, is unable to

withstand significant variations in humidity.

In the argument above, the two portions in boldface play which of the following roles?

A.     The first is an objection that has been raised against the position taken by the argument; the second is the position taken by the argument.

B.     The first is the position taken by the argument; the second is the position that the

argument calls into question.

C.     The first is a judgment that has been offered in support of the position that the argu-

ment calls into question; the second is a circumstance on which that judgment is,

in part based.

D.     The first is a judgment that has been offered in support of the position that the argu-

ment calls into question; the second is that positon.

E.      The first is a claim that the argument calls into question; the second is the position

taken by the argument.

                          Answer:

答案是D，我选B，

请大牛帮忙分析一下。

从性质来看，第一句是说明性质的陈述，证据或判断，

第二句是表明立场的

本题目的作者的立场是不赞同通过降低标准来节约成本的。

很明显是D

推理中说的是：

1原来：油画放在温湿度变化小的环境

2现在：新实验结果表明，其实颜料可以适应

3一个错误的推理：

现在很多director认为：颜料是最敏感物质（第一个黑线：这个假设是错的，见第四点说明），既然颜料可以适应，所以画不用放在严格环境，所以可以节省费用（第二个黑线：这个结论是错的，因为前面的假设是错的）

4错误之处：

除了颜料外，颜料中的gesso对湿度敏感，所以要遭

所以是D

两黑体中间的then 我怎么觉有点矛盾啊  前面说敏感 后面就推出可以放宽保护吗??

好怪啊