Noise includes: ____________ noise, ____________ noise, ____________noise and ____________noise.

3.Wearing noise-canceling headphones can give yourself some quiet while working.

Not until midnight ______. A: did the noise stop B: the noise stopped C: the noise did stop D: stopped the noise

Noise differs from sound in that ______. A: noise interferes with the task being done B: noise is a special type of loud sound C: noise is usually unavoidable in big cities D: noise can be defined more precisely than sound

Arranging appointments usually involves making, confirming, delaying, changing or even canceling an appointment.

Exposure to high-pitched noise results in more errors than exposure to low-pitched noise

The machine was making __________. A: lot of noise B: lot of noises C: a lot of noise

[A] The noise came from the tires. [B] The noise came form the brakes.[C] The noise came from another car passing by. [D] The noise came from Mrs. Jones’ singing.

As an experienced technician， you are responsible for Technical Support. A customer calls to askthe best signal level and noise level for cell phone. How to respond？（） A:  -40dBm signal and -90dBm noise B:  -50dBm signal and -90dBm noise C:  -30dBm signal and -90dBm noise D:  -20dBm signal and -90dBm noise

Newton took his revenge on Flamsteed by canceling all reference to him in later edition of Principia.