Question 1:D

Question 2: D.

Question 1: test analysis: this question examines the change of foreign exchange rate and asks how much it costs when the most cost-effective time is compared with the least cost-effective time. Therefore, it is necessary to calculate the expenditure at the most cost-effective and least cost-effective time. As can be seen from the table, the most cost-effective time should be when the RMB appreciates, that is, 1 USD =6.7878 yuan, then 1000 USD = if it is 1 =6.7993 yuan, then 10000 USD =67993 yuan, that is, the most.

Question 2: Test and analysis: This question examines the impact of exchange rate changes on import and export. According to the exchange rate changes on May 20 10 and August 22, 20 10, it can be seen that the depreciation of the US dollar, the appreciation of the RMB, the increase of imports and the decrease of exports, that is, the RMB exchange rate is directly proportional to imports and inversely proportional to exports, so ② ③ meets the question.