On September 30, 2021, the most recent world’s fair opened in Dubai, UAE. Itmarks 170 years of international exhibitions that display the   (17)   and culturalachievements of the world’s nations. Over the years, the nature of these exhibitions haschanged   (18)   global priorities. The first world’s fair was held in London in 1851.Visitors saw the latest fruits of the industrial age,   (19)   electric telegraphs andtelescopes. Around the mid-twentieth century, the exhibitions began to focus more onthe   (20)   of building a prosperous future for humankind. From the late ’80s, world’sfairs mostly became __  (21)   for countries to build their national brands. (22) , the2015 world’s fair in Milan once again signaled a shift in tone. Instead of building upnational images, it focused on solving the crises our planet faces.
【題組】17.
(A) harmful
(B) impatient
(C)innocent
(D) technological