单选题 . ①One might assume the most admired architecture would be the best built. ②This was generally true in the past, but in the twentieth century, when new materials and new aesthetic theories often drove architects to cavalier experimentation, even celebrated architects fell short. ③When designing the Centre Georges Pompidou in Paris, Renzo Piano and Richard Rogers turned the building literally inside out. ④.Previously hidden elements such as pipes, ducts, and elevators were exposed to view—and exposed to the elements. ⑤The result might have been foreseen: after only twenty years, the building was closed for a two-year renovation. ⑥Although the authorities maintained that the unexpectedly large numbers of visitors necessitated the renovation, much of the budget was spent on refurnishing the facade.

17. Which of the following best describes the function of the highlighted sentence? ______

A、 It helps substantiate the author's claims about pre-twentieth-century architecture.
B、 It provides a specific example of the trend cited in the previous sentence.
C、 It bolsters the claim that modern architecture abhors aesthetic experimentation.
D、 It restates the assumption mentioned in the passage's opening sentence.
E、 It marks a transition to a discussion of French architectural trends.

【正确答案】 B

【答案解析】 B：定位句是一个例子，用于支持前一句认为从20世纪开始，受欢迎的建筑标准发生了改变的观点，故选项B正确。