24 (Refer to FAA-CT-8080-2G, Figure 22, area 2.) At Coeur D`Alene which frequency should be used as a Common Traffic Advisory Frequency (CTAF) to monitor airport traffic?
B. 135.075 MHz.
This is not the correct answer.
135.075 MHz is the radio frequency where a pilot can hear the computer-generated real-time weather at the AWOS station. 
The Automated Surface Observing System (ASOS) program was a joint effort between the Federal Aviation Administration (FAA) and the National Weather Service (NWS) to deploy a network of high-grade weather monitoring stations across the United States.
The Automated Weather Observation Station AWOS) that provides 24-hour, real-time weather data for all types of airports. Each completely automated weather station includes sensors to determine visibility, cloud height, temperature, dew point, wind speed, wind direction, pressure, and precipitation integrated with a complete data collection and dissemination package.
The primary function of the ASOS is to provide minute-by-minute observations and generate the basic Aviation Routine Weather Report (METAR) and Aviation Selected Special Weather (SPECI) report. This information is essential for safe and efficient aviation operations, and is used by the public to plan day-to-day activities. ASOS also provides valuable information for the hydrometeorologic, climatologic, and meteorologic research communities.
ASOS and AWOS are basically the same systems.  The primary difference is in which agency owns it.
Now you know what this stuff is as your airplane taxis to your gate.
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