Analysis of test questions: RMB appreciation means that 100 unit of foreign currency is less than in the past. The decline of foreign exchange rate and the rise of RMB exchange rate are not conducive to China's commodity exports and are conducive to imports. Therefore, choose D in this question. ① ④ Error.

Comments: This question is about the exchange rate. This formula can be used: exchange rate rise → domestic currency depreciation → beneficial to domestic commodity export (unfavorable to domestic import) → unfavorable to domestic (internal and external) investment → increasing domestic employment → increasing national income. Other statements can be converted into the above formula for derivation, which simplifies complex problems.