Answer:
Wi-Fi technologies provide internet access to buildings or institutions. However, at higher frequencies, they can cover large geographic areas, such as a town.
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To ensure safety, it would be best to eat leftover foods that have been refrigerated within three days. Leftovers are usually refrigerated to prevent the growth of bacteria. If these leftovers are not refrigerated and are left on room temperature for more than two hours, then these should be discarded. The answer for this is C.
He is inferring that the place is as crowded or popular as a circus.
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It is D, I would not put the section in there if I had not used the method myself!