The new type of exterior of a building can be________ .A、a romantic memory of the past
B、visual pollution of the environment
C、both a decorative art and a protector
D、both a protector and a host for certain organisms
【正确答案】：D
【题目解析】：细节判断题。首先定位题干中的new … exterior of a building，发现第五段中提到“the exterior of a building…Not just a protective thing, a host; it allows other things to grow on it”。这一内容正好与选项D相符。故而选项D为正确答案。