单项选择题The steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.
单项选择题There is a trend towards equal opportunities for men and women.
单项选择题Efficient air service has been made available through modern technology.
单项选择题Customers are well waited on in this big department store.
单项选择题People from many countries were drawn to the United States by the growing cities and industries.
