女性患者，20岁，无明显诱因出现右侧眼睑下垂2个月，晨轻暮重。查体：右侧眼睑下垂，双侧眼球各方向运动充分，瞳孔大小无改变。最可能的诊断为

A．多发性硬化

B．重症肌无力

C．右侧动眼神经麻痹

D．右侧外展神经麻痹

E．右侧面神经麻痹

As a free-floating currency, Japanese yen often fluctuates with the US dollar, and destabilizes the country’s economy and financial system.