Question

wind tunnels: a test of form and function
look up at the sky, and you are likely to see airplanes, helicopters, and other types of aircraft soaring high above you. what you might not realize is that these aircraft all had to pass a series of tests to be considered safe enough to fly. one tool that researchers use when testing aircraft is a wind tunnel. this essential machine helps scientists improve the design of aircraft
how wind tunnels work
wind tunnels are tubes that vary in size depending upon the object being tested. airplanes require huge wind tunnels. at one end of the tunnel is a fan blowing air. the fan can be set to different speeds and directions. an object is held in place in the tube, either with physical restraints or with the use of magnets. then the fan blows air around the object, creating an effect similar to flying
wind - tunnel experiments help us understand how an object reacts to different wind situations. the tests can show how wind speed and direction affect the object while taking off, flying, and landing. researchers search for hidden flaws in the design of objects such as an aircraft. to help do this, they often add smoke or colored dye to the air. then the researchers photograph how the smoke or dye moves over the object while the fans are on
how does the section benefits of wind tunnels contribute to the meaning of the passage?
a it describes the invention of the wind tunnel
b it reveals various advantages of wind tunnel use
c it demonstrates why wind tunnels are most helpful to pilots
d it provides a list of reasons why wind tunnels are used daily

Explanation:

The section "Benefits of Wind Tunnels" would likely focus on the advantages of using wind - tunnels. This could include how they help in aircraft design improvement, understanding object - wind interactions, etc.

Answer:

B. It reveals various advantages of wind tunnel use