使声带松弛的肌肉是（）
A．环甲肌
B．甲杓肌
C．环杓后肌
D．环杓侧肌
E．杓肌
参考答案：B
— How about climbing the hill?
— I would rather __________ along the river than __________ the hill. I'm a bit tired.
A．walk；climb
B．walking; climbing
C．walking; to climb
D．walk; to climb
电脑的一个usb接口最多可以接多少个可自供电的设备？（）
A.127
B.4
C.16
D.254
