Periods may occasionally start as young as_____ years old and still be considered normal. A:7 B:10 C:8 D:6 答案: 8 点我阅读全文
Menstruation is a woman’s _______ bleeding. A:yearly B:weekly C:irregular D:monthly 答案: monthly 点我阅读全文
The first period usually begins _______. A:between 12 and15 years of age B:between 10 and 12 years of age C:betwee 点我阅读全文
A menstrual cycle is counted from_______ to the first day of the next period. A:the second day of the period B:the f 点我阅读全文