Test analysis: exchange rate, also known as exchange rate, is the exchange rate between two currencies. If 100 unit of foreign currency can be exchanged for more RMB, it means that the foreign exchange rate will rise, the foreign currency will appreciate, the RMB exchange rate will fall and the RMB will depreciate; On the contrary, it shows that the foreign exchange rate falls, the foreign currency depreciates, the RMB exchange rate rises and the RMB appreciates. C meets the meaning of the question and should be selected; A, b and d don't meet the meaning of the question, so the answer is C.