Test analysis: a mistake, it is not cost-effective to buy now, and we have to pay more RMB to rule it out. B wrong, it's not cost-effective to buy now, and you have to pay more RMB, so rule out. C fits the question. After the appreciation of RMB, the purchasing power abroad will be greater, and there are too many goods to buy, so you should choose. D wrong, after the appreciation of RMB, you can buy more foreign goods with RMB, so it is excluded.

Comments: This kind of examination requires students to master the impact of exchange rate fluctuations on people's lives. The rise of RMB exchange rate shows that RMB appreciation and foreign currency depreciation are beneficial to imports but not to exports, and RMB depreciation shows that RMB depreciation and foreign currency appreciation are beneficial to exports and not to imports. This topic is difficult, and students are required to analyze and judge according to their knowledge and materials.