A-A+
According to the passage conversion rates ___
问题详情
According to the passage, conversion rates ______.
A．are always changing
B．are determined by financial institutions
C．are agreed upon by two wading countries
D．vary from day to day
参考答案
正确答案：D
解析：见第三段第七句话“... although it will often fluctuate from day to day”，fluctuate有“波动”之意。
