Fast reading 2:Online shopping has become a major force in retailing this year with more than US$ 1 billion in Christmas season sales, industry analysts say.The figure for the holiday tops the total for Internet shopping in all of 1996.Online shopping for the holiday season remained just a drop in the ocean of the estimated US$ 450 billion spent by US consumers. But the figure is growing rapidly.International Data Corporation, a market research group, predicts the World Wide Web population will reach almost 100million by 1998 and that online commerce will grow to more than US$ 20 billion.28. The passage is mainly about _____.