What is one reason close-ups of people are used in the video?
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A. To show students how not to duck and cover.
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B. To show students how hard it was to duck and cover.
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C. To show students that they will get hurt when they duck and cover.
D. To show students how to duck and cover.

One important reason why close-ups of people are used in the video is so that the  students can be shown how to duck and cover.  the video "duck and cover" teaches children that when they see a flash, they should duck and cover, so it was necessary to use close-ups of people so that the children can clearly see how to duck and cover.

Explanation:

a, both were musicians during the jazz age

john maynrd keynes developed new economic respose to the                           ( b. great depression if the 1930's)