问题如下：
The exchange rate of Country A's currency relative to the US dollar is 1.5, and the exchange rate is fixed at any time. Country A issues domestic currency but also accept US dollars in many businesses. The description of exchange rate regime of Country A is:
选项：
A. a fixed peg.
B. dollarization.
C. a currency board system.
解释：
C is correct.
A currency board system is to exchange domestic currency for another foreign currency at a fixed exchange rate. Country A issues its own domestic currency therefore is not dollarization. A fixed peg allows a margin of deviation from the target exchange rate.
考点：Exchange Rate Regimes
解析：货币发行局制度是以固定的汇率将本国货币兑换成另一种外国货币。所以C选项正确。
A国发行本国货币因此不是美元化。所以B选项不正确。
固定汇率制允许与目标汇率有一定的偏差。
这个为什么不能理解为盯住他国的汇率？A为何错了？
