止于下颔角外面的肌是（）
A.翼外肌
B.翼内肌
C.咬肌
D.颞肌
E.颊肌
参考答案：C
—Hi, Anna. Thank you for ________ my little sister last week.
—You're welcome [ ]
A. looked after
B. look after
C. to look after
D. looking after
防止软盘感染病毒的有效方法是定期格式化软盘。
