紧急避孕是指无防护行性交后72-120小时内采取的避孕方法,是防止意外妊娠的重要措施。
A、正确
B、错误

单项选择题Which sentence does NOT belong to the scope of IT-patterns. A、It is the quality of one’s convictionsthat determines success, not the number of followers. B、It was a bright cold day in April, and the clocks were striking thirteen. C、It is during our darkest momentsthat we must focus to see the light. D、It is the most incredible story I have ever heard.

单项选择题乳牙灵长类间隙位置是在 A、乳切牙区 B、乳尖牙区 C、乳磨牙区 D、上颌乳尖牙远中和下颌乳尖牙近中 E、上颌乳尖牙近中和下颌乳尖牙远中