第一个对，因为，noise是一个可数名词。
What's that noise?
哪来的响声？
Don't make a noise .
别出声。
They were making too much noise.
他们的噪声太大了。
I was woken by the noise of a car starting up.
我被汽车的启动声吵醒了。
We had to shout above the noise of the traffic.
车辆噪声太大，我们不得不扯着嗓子说话。
to reduce noise levels
减少噪音量
2
[U] (technical 术语) 噪声；干扰；电子干扰讯号
extra electrical or electronic signals that are not part of the signal that is being broadcast or transmitted and which may damage it
3
[U] 干扰信息；垃圾信息
information that is not wanted and that can make it difficult for the important or useful information to be seen clearly