請依下文回答第 46 題至第 50 題 Elephant ivory has been exported from Africa and Asia for hundred of years. Throughout the colonization of Africa, ivory was removed to be used for piano keys, billiard balls and other 46 of exotic wealth. World wars and the subsequent economic depressions caused a pause in this luxury commodity, but increased prosperity in the early 1970s saw a 47 . Japan, relieved from its exchange restrictions imposed after World War II, started to buy up raw ivory for the production of hankos—the name seals. 48 this period, most name seals had been made from wood with an ivory tip, carved with the signature. But increased prosperity 49 the formerly unseen solid ivory hankos in mass production. By the 1970s, Japan 50 about 40% of the global trade; another 40% by Europe and North America, often worked in Hong Kong, which was the largest trade hub, with most of the rest remaining in Africa. 【題組】48 (A)Not until (B)Shortly after (C)All over (D)Prior to
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