—Pardon? It's difficult to hear your _______ because the _______ of traffic is too loud.
A:voice; noise
B:sound; voice
C:noise; sound
D:noise; voice
蝗虫、沼虾、蜈蚣三者所具有的共同特征是( )
自然界中的水都不是纯水,通过多种途径可以使水得到净化。下列方法得到的水最纯的是( )