单项选择题
A.prevented B.restrained C.hindered D.refrained
A.Because they have gained much publicity through the American media. B.Because they represent the world's latest fashions. C.Because they embody the most sophisticated technology. D.Because they are available at all tourist destinations.
A.the weakening if the U.S. dollar can result in trade deficits B.the lower the retail prices, the greater the profits C.tourism can make great contributions to its economy D.visitors to the U.S. are wealthier than U.S. tourists abroad