Technological Developments h 249- D—Postindustrial economies, in which agricul-
ture, mining, and industry are highly productive,
feature relatively large numbers of employment
opportunities in service industries. - C—Radar was first used in World War II.
The other answer choices were initially used in
World War I. - A—The Helsinki Accords called for communi-
cation between communist and noncommunist
nations, making (C) and (E) incorrect responses.
They did not address nuclear disarmament (B)
or space flights (D).
4. E—Railroads were a nineteenth-century inven-
tion, whereas the remaining response choices
were developed in the twentieth century.
5. D—Twentieth-century developments included
nuclear weaponry. They also included house-
hold appliances (A) and advances in entertain-
ment (E). At the end of the twentieth century,
the United States and the Soviet Union coop-
erated in space dockings and an international
space station (C). Radio was more popular in the
United States than in Europe (B).
❯ Answers and Explanations
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