研究表明，噪声污染对海洋生物带来了危险，科学家将来要采取措施拯救海洋生物，阻止噪音对海洋生物的伤害。
11．C 细节理解题。由第一段Some scientists say that animals in the ocean are increasingly threatened by noise pollution caused by human beings.可知，来自人类的噪声污染对海洋生物带来了危险。
12．B 细节理解题。由第二段These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.可知，ocean drilling不是自然界的声音。
