滑车神经支配的肌肉是
A．上斜肌B．下斜肌C．外直肌D．眼轮匝肌E．瞳孔开大肌
参考答案：A
— There’s somebody at the door. Who ______ it be? Is it the postman ?
—No, it ______ be him. It’s just seven o’clock. It’s too early.
A．may, can’t
B．will, won’t
C．may, mustn’t
D．must, may not
