题目

— Why do you look sad?— There are so many problems _____. A . remaining to settle B . remained settling C . remaining to be settled D . remained to be settled 答案：C成语“震耳欲聋”从物理学角度看是形容声音的 大，有资料显示，噪声每经过一块100m宽的林带可降低20～25分贝．新建的苏州火车站在两侧种着许多树木，这是为了在 减弱噪声．